*The drill body is made of hard alloy steel, and the drill bit adopts a high-hardness tungsten steel alloy cutter head, which has a longer service life.*Applicable: Punching of concrete, marble, red brick wall, cement wall, stone, etc.- The spiral chip space design speeds up chip removal, improves work efficiency and saves time and effort.* Specification:- Product material: 40 chrome vanadium steel- Drill bit material: tungsten steel- Drill diameter：14mm- Working length：80mm,120mm,270mm- Total length：150mm,200mm,350mm- Shank Type：Square handle, Round handle- Quantity : 1 pcs*Note: Three-jaw electric drill is not recommended*Tips:This electric hammer drill bit is divided into two holes and two grooves with round shank and four holes with square shankPlease see the grip of the electric hammer before buyingTwo pits with round handle are suitable for round handle electric hammers and light electric hammersSquare handle four pits are suitable for square handle electric hammers