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HARFINGTON Twist Drill Bit 37/64″ Dia High-Speed Steel 4341 Metric Drill Bits 5.7″ Overall Length with Black & Gold Oxide Coating for Drilling Hard Metals, Stainless Steel, Alloy Steel 37/64″ x 5.7″ x 3/8″
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What people love (and don’t love)
What people love
High quality and sharp, allowing precise drilling and cutting of steel.
Runs true and maintains cutting edges even after multiple holes.
Good value for the price and works well for light to moderate tasks.
Received quickly and as advertised.
Recommended for DIYers for casual use with reliable performance.
What people don’t love
Some users experienced poor quality, with the drill bending when used on very tough materials like cast iron.
Might not be ideal for heavy-duty or extremely tough drilling tasks.
Minor percentage of negative reviews indicating durability concerns.
A sharp and precise drill bit well-suited for general use but may struggle with very tough materials.
If you need a larger, jobber-length bit for tougher materials, the HARFINGTON 37/64″ twist drill bit is designed to handle hard metals with less wandering and smoother chip evacuation. It’s made from high-speed steel (HSS) 4341 and finished with a black & gold oxide coating to support wear resistance during demanding drilling tasks.
You can view the current price and full details on Amazon here.
The fully ground spiral flute design helps clear debris quickly to reduce friction and heat buildup, while the 135° split point helps the bit start more accurately on the surface—especially useful when drilling into stainless steel and alloy steel. With a straight shank (3/8″) and an overall length around 5.5–5.7 inches, it’s a solid pick when you need reach without stepping up to specialty tooling.
Recommended for: stainless steel, mould steel, alloy steel, cast iron, aluminum alloy, copper, hard plastics, and even wood when needed. Not recommended for: glass, tile, wall, stone, or ceramic materials.
Tip: Use appropriate cutting fluid or oil and manage speed/pressure to help extend bit life, especially in harder metals.
37/64″ (14.29 mm) cutting diameter with straight 3/8″ shank
High-speed steel (HSS) 4341 construction for hardness and wear resistance
Black oxide & gold oxide finish
135° split point helps reduce walking for more accurate starts
Fully ground spiral flutes to evacuate chips and reduce heat
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