parts of twist drill bit

The parts of twist drill bit is much tougher than the HSS used in other similar bit sets. These bits contain 5% cobalt for increased wear resistance and durability.
The Drill Bit For Metal is suitable for most electric drills on the market today and comes with a portable plastic housing for easy storage and finishing.
The Metal Drill Bit is designed to quickly remove particles, reduce friction and heat, and achieve faster, cooler drilling performance.
Long Metal Drill Bits are ideal for cutting hard metals such as stainless steel, steel, sheet metal and cast iron as well as plastics, aluminum alloys, wood and other softer metals.