Marble Opener Drill Bit Hole Saw for Tile Concrete Glass

Firstly tilt 45 degree to position the hole, then drill vertically (recommended speed about 800-1000rpm). The hole saw works on bench drill, power drill and NaMachine tools with drilling function but not on drill. Suitable for a variety of stone, ceramic, vitrified tile, glass, etc. Constantly adding water to cool the drill bit when drilling. Item Type: Drill Bit Specification: 80mm, 85mm (Optional) Total Length: 80mm / 3.15in Shank Length: 5mm / 0.2in Shank Diameter: 9.4mm / 0.37in Working Depth: 54mm / 2.13in