JSSEVN - 4.2mm Pack of 10 double-ended cobalt drill bits, made of high-speed steel M35, suitable, commonly used by DIYers (4.2 mm)

10 Cobalt Drill Bits: 10 pieces - 13/64 inch (hole diameter) metal drill bits. This drill bit set fits most drills currently on the market.

M35 High-Speed Cobalt Steel Drill Bit Set: Industrial-grade M35, harder than the HSS 6542 steel found in other similar drill bit sets. These bits also contain 5% cobalt, increasing wear resistance and lifespan.

Fully Ground Process and 135° Split Point: The fully polished spiral design quickly removes particles, reduces friction and heat for faster, cooler drilling performance. The 135° split point blade with a straight shank prevents slippage and ensures accurate, fast drilling.

Multifunctional: Perfectly suited for cutting hard metals such as stainless steel, steel, sheet metal and cast iron, plastic, aluminum alloy, wood, and other softer metals. When drilling, pay attention to the speed, pressure, and heat setting.

Double-ended drill bit: The two cutting points of a single drill bit: when one cutting point is drilled, the other cutting end can be used as a new drill bit.