Features Precision Drilling Technique: Tilt to 45° for accurate positioning and drill vertically at optimal speeds of 800-1000 RPM for flawless holes Versatile Compatibility: Designed to work seamlessly with bench drills, power drills, and machine tools, ensuring flexibility in your drilling projects Multi-Material Capability: Perfectly suited for various materials including stone, ceramics, vitrified tiles, and glass, making it an essential tool for any DIY or professional task Enhanced Cutting Efficiency: Segmented cutting edges minimize resistance and facilitate efficient chip removal for faster and cleaner drilling Secure and Stable Operation: The triangle drill shank design prevents skidding and provides excellent torque handling, ensuring stability during use Features: 1、Firstly tilt 45 degree to position the hole, then drill vertically (recommended speed about 800-1000rpm). 2、The hole saw works on bench drill, power drill and machine tools with drilling function but not on impact drill. 3、Suitable for a variety of stone, ceramic, vitrified tile, glass, etc. Constantly adding water to cool the drill bit when drilling. 4、Segmented cutting edges reduce cutting resistance, which is also conductive to chip removal. 5、Triangle drill shank can effectively prevent skidding when drilling and bear greater torque. 6、Oval hole design on the drill bit for effective chip removal. Specification: Item Type: Diamond 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 Package List: 1 x Drill Bit Package List 1 x Drill Bit