10 Best Metal Drill Bits 2026 in the United States
#1
Winner
BOSCH CO21B 21-Piece Assorted Set with Included Case Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum
The BOSCH CO21B 21-Piece Drill Bit Set offers a solid choice for anyone needing reliable metal drilling tools. Made from Cobalt M42 alloy, these bits are designed for tough jobs involving stainless steel, cast iron, titanium, and other metals. The inclusion of 8% cobalt makes them much more durable and heat-resistant than standard bits, meaning they won’t wear out quickly under heavy use or high temperatures. This feature is especially useful if you frequently drill hard metals.
Rating
10.0
Chosen by1,100
Material
Size
Point Angle
Most important from
7125 reviews
#2
IRWIN Tools Hanson Machine Screw/Fractional/Metric Tap and Hex Die and Drill Bit Deluxe Set, 117 Piece 26377, Silver/Blue
The IRWIN Tools Hanson 117-piece deluxe set is a comprehensive kit designed mainly for rethreading tasks in auto and machinery repair. Made from high carbon steel, these drill bits and taps offer good durability, which is important when working with tough metals like alloy steel. The drill bits have a 118-degree point angle and two flutes with a spiral design, helping them cut through metal efficiently. The brushed finish and hex shank type add to their reliability and ease of use.
Rating
9.4
Material
Coating
Size
Most important from
244 reviews
#3
BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case - M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal
The BOSCH CO14B 14-Piece Assorted Set offers a robust solution for anyone looking to drill through tough metals like stainless steel, cast iron, and titanium. The standout feature here is the use of Cobalt M42 material, which is designed to provide exceptional durability and can withstand high temperatures—making these bits last up to 10 times longer compared to standard drill bits. This is particularly useful for frequent users or those working with harder metals, as it minimizes the need for frequent replacements.
Rating
8.8
Material
Coating
Most important from
7125 reviews
Top 10 Best Metal Drill Bits 2026 in the United States
#1
Winner
BOSCH CO21B 21-Piece Assorted Set with Included Case Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum
BOSCH CO21B 21-Piece Assorted Set with Included Case Cobalt M42 Metal Drill Bit with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, Light-Gauge Metal, Aluminum
Material: Cobalt
Size: 21-Piece Drill Bit Set
Point Angle: 135 Degrees
Flute Design: Spiral
Chosen by 1100 this week
IRWIN Tools Hanson Machine Screw/Fractional/Metric Tap and Hex Die and Drill Bit Deluxe Set, 117 Piece 26377, Silver/Blue
IRWIN Tools Hanson Machine Screw/Fractional/Metric Tap and Hex Die and Drill Bit Deluxe Set, 117 Piece 26377, Silver/Blue
Material: High Carbon Steel
Coating: Brushed
Size: 20.6 x 13.7 x 3.1 in
Point Angle: 118 Degrees
Flute Design: 2 flutes, spiral
BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case - M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal
BOSCH CO14B 14-Piece Cobalt Drill Bit Set with Included Case - M42 Metal Drill Bits with Three-Flat Shank for Drilling Applications in Stainless Steel, Cast Iron, Titanium, and Light-Gauge Metal
Material: Cobalt
Coating: Titanium
Size: 1/16” to 1/2”
Point Angle: 135 Degrees
Flute Design: thick web-helix
DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361)
DEWALT Drill Bit Set, 21 Pc. Titanium Nitride Coated Pilot Point DEWALT Bit Set with Case for Wood, Metal and Plastic (DW1361)
Material: Titanium Nitride
Coating: Titanium Nitride
Size: 1/16-inch to 1/2-inch
Point Angle: 135 Degrees
Flute Design: Spiral
IRONANT Step Drill Bits, 5PCS Spiral Grooved HSS Titanium Step Drill Bit Set, 50 Sizes High Speed Steel Step Bits for Metal with Aluminum Case
IRONANT Step Drill Bits, 5PCS Spiral Grooved HSS Titanium Step Drill Bit Set, 50 Sizes High Speed Steel Step Bits for Metal with Aluminum Case
Material: High-Speed Steel, Titanium
Coating: Titanium
Size: 5 pieces, 50 sizes
Point Angle: 118°
Flute Design: Spiral Dual-flute
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CaRoller Cobalt Drill Bit Set 29-Piece M35 Cobalt Steel Metal Drill Bits Durable Round Shank Drill Sets for Steel, Wood Plastic Sheet Metal – Includes Practical Cup-Type Holder (29pcs Cobalt)
CaRoller Cobalt Drill Bit Set 29-Piece M35 Cobalt Steel Metal Drill Bits Durable Round Shank Drill Sets for Steel, Wood Plastic Sheet Metal – Includes Practical Cup-Type Holder (29pcs Cobalt)
Material: M35 cobalt steel
Coating: Amber Coating
Size: 1/16" to 1/2"
Point Angle: 135 Degrees
Flute Design: Three-flute spiral
DEWALT Drill Bit Set, 3-Flats Shank,14-Piece, 135 Degree Split Point, for Plastic, Wood and Metal (DWA1184)
DEWALT Drill Bit Set, 3-Flats Shank,14-Piece, 135 Degree Split Point, for Plastic, Wood and Metal (DWA1184)
Material: High Speed Steel
Coating: black and gold
Size: 14 piece set
Point Angle: 135 Degrees
Flute Design: Spiral
Milwaukee Electric Tools 48-89-2332 29Pc Cobalt Helix Drill Bit Set, Red
Milwaukee Electric Tools 48-89-2332 29Pc Cobalt Helix Drill Bit Set, Red
Material: Cobalt
Coating: cobalt
Size: 29 pieces
Flute Design: Straight
Milwaukee 48-89-9224 Step Bit 6-Piece Set (#1, 4, 6, 7, 8, 9)
Milwaukee 48-89-9224 Step Bit 6-Piece Set (#1, 4, 6, 7, 8, 9)
Material: Alloy Steel
Coating: Black Oxide
Size: 6-Piece Set (#1,4,6,7,8,9)
Flute Design: Spiral
#10
Milwaukee 29 Pc. Cobalt Red Helix Metal Drill Bit Set
Milwaukee 29 Pc. Cobalt Red Helix Metal Drill Bit Set
Material: Cobalt
Coating: Black Oxide
Size: 29 Pieces
Point Angle: 135°
Flute Design: Red Helix
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Buying Guide for the Best Metal Drill Bits
Choosing the right metal drill bit can make a significant difference in the quality and efficiency of your drilling projects. Metal drill bits are specifically designed to cut through metal surfaces, and selecting the right one involves understanding various specifications and how they align with your needs. Here are the key specifications to consider when picking metal drill bits and how to navigate them.MaterialThe material of the drill bit is crucial because it determines the bit's durability and effectiveness in cutting through metal. Common materials include high-speed steel (HSS), cobalt, and carbide. HSS bits are suitable for general-purpose drilling and are more affordable. Cobalt bits are more durable and can handle harder metals, making them ideal for tougher jobs. Carbide bits are the hardest and most durable, perfect for heavy-duty and high-precision tasks. Choose HSS for light to moderate tasks, cobalt for tougher metals, and carbide for the most demanding applications.
CoatingCoatings on drill bits enhance their performance and longevity. Common coatings include black oxide, titanium, and diamond. Black oxide increases the bit's resistance to rust and wear, making it suitable for general use. Titanium coatings reduce friction and heat buildup, extending the bit's life and making it ideal for frequent use. Diamond coatings are the hardest and provide superior cutting performance, especially for very hard metals. For occasional use, black oxide is sufficient. For frequent drilling, titanium is a good choice, and for the hardest metals, diamond-coated bits are the best.
SizeThe size of the drill bit, including its diameter and length, determines the size of the hole you can drill and the depth you can reach. Drill bits come in various diameters, typically measured in millimeters or inches. Smaller diameters are suitable for precision work and smaller holes, while larger diameters are used for bigger holes. The length of the bit affects how deep you can drill. Choose the size based on the specific requirements of your project, ensuring the diameter matches the hole size you need and the length is sufficient for the depth you want to achieve.
Point AngleThe point angle of a drill bit affects how it cuts into the metal. Common point angles are 118 degrees and 135 degrees. A 118-degree point angle is standard and works well for softer metals, providing a good balance between cutting speed and control. A 135-degree point angle is flatter and more suitable for harder metals, offering better precision and reducing the risk of the bit wandering. For general-purpose drilling, a 118-degree angle is usually sufficient. For harder metals or more precise work, opt for a 135-degree angle.
Flute DesignThe flute design of a drill bit refers to the grooves that spiral up the bit, helping to remove chips and debris from the hole. Standard flutes are suitable for most drilling tasks, providing a good balance of chip removal and strength. Parabolic flutes are deeper and more efficient at removing chips, making them ideal for deeper holes and softer metals. For general use, standard flutes are adequate. If you are drilling deeper holes or working with softer metals, consider bits with parabolic flutes for better performance.