Quick facts
- Brand: PATIKIL
- Price: USD 9.99
- Rating: 4.60 (179 reviews)
If you drill stainless steel or other tough materials regularly, the PATIKIL 4.2mm M35 cobalt jobber drill bits are a practical value buy. You get 10 matching bits with a 135° split point tip designed to start more accurately (with less wandering) and a gold finish that helps improve corrosion resistance and extend bit life.
You can view the current price and full details on Amazon here.
These are straight-shank, spiral-flute twist drills intended for metal work, but they’re also listed as suitable for carbon steel, iron, aluminum, copper, plastic, and wood. For best results—especially in thicker stock—use cutting fluid, keep the bit square (90°) to the surface, and drill in multiple passes to reduce overheating and breakage.
- 10-pack of 4.2mm jobber drill bits with 43mm flute length and 75mm overall length
- M35 high-speed steel with 4.50%–5.50% cobalt content for hardness, wear resistance, and heat resistance
- 135° split point tip helps with faster starts and reduced walking
- Gold finish to improve corrosion resistance and support longer service life
- Suitable for stainless steel and other materials including carbon steel, iron, aluminum, copper, plastic, and wood
- Round straight shank with 2-flute spiral design
Tip: Harder materials generally require lower spindle speed and feed rate. For larger holes, start with a guide hole, and use cutting fluid to improve efficiency and reduce material damage.
