HIGH QUALITY ALLOY CUTTING HEAD: the drill bit is made of cemented carbide, and its hardness is higher than the ordinary drill bit. The cutting resistance is small and the drilling EFFICIENCY is high. U-TYPE DRILL BODY : drill has been slotted, the surface of the drill body is clean and NO burr, the paint is treated to prevent rust, and the chip removal is more smooth. ANTI-SKID TRIANGULAR HANDLE: a unique triangular shape of the handle, so that the drill can be tightened and not slipped. OPENING NEAT-SMOOTH: no broken edge, no tremor phenomenon, incision resistance is small AND the hole speed is very fast, easy chip evacuation and so on .It’s easy to decorate after drilling the hole. high temperature quenching: high HARDNESS, more DURABLE and LONGER SERVICE LIFE.