A drill bit is the cutting device located at the end of a drilling machine's drill string . Like the bit on a hand-held drill, it creates a passage through the material into which it bores. It may assist -- to some extent -- in removing the material which it cuts away to form the passage. Specification: Use: Metal Drilling DIY Supplies: Metalworking Model Number: FD-H01 Type: Center Drill Bit Finish: amber finish Size: 5mm Suitable for drilling: steel, stainless steel, spring steel, special steel etc. Package includes: 1 x FANGDA Tools 10pcs 5mm High Quality HSS Drill Bits HSS M2