If you’re frequently drilling harder metals and want a more durable step up from basic HSS bits, this PATIKIL 8.5mm jobber drill bit is designed for demanding work. It’s made from M42 high-speed steel formulated with 8% cobalt for high hardness, wear resistance, and heat resistance—helpful when cutting through medium-to-high hardness metals.
You can view the current price and full details on Amazon here.
The titanium nitride (TiN) coating is intended to help resist oxidation/corrosion and extend service life. A 135° split point helps the bit start more precisely, while the straight shank fits common drill chucks.
Use it across a wide range of materials including stainless steel, iron, aluminum, copper, plastics, and wood. For best results, keep the bit at a 90° angle to the workpiece and slow the drilling speed as material hardness increases.
8.5mm cutting diameter (≈0.33 in / ≈21/64 in) jobber bit; 63mm flute length and 115mm overall length
M42 high-speed steel with 8% cobalt for high hardness, wear resistance, and heat resistance
Titanium nitride (TiN) coating to help reduce oxidation/corrosion and extend tool life
135° split point for more controlled starts; 2-flute spiral design with straight shank
Suitable for stainless steel and other materials like iron, aluminum, copper, plastics, and wood (adjust speed for harder materials)
What you get: 1 drill bit (1 pack).
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