Features No Lubrication Needed: Aviation lubrication is not required, allowing for hassle-free maintenance and ensuring a long service life with special high-performance grease Easy Tool-Free Removal: The innovative design of the inner and outer bearing rings allows for quick and easy removal without the need for special tools, saving you time and effort Compact & Quiet Operation: This small and compact pneumatic turbine vibrator operates at very low noise levels, making it ideal for various applications without disruptive sound Durable Aluminum Alloy: Constructed from lightweight and resistant aluminum alloy, this air turbine oscillator withstands harsh environments, ensuring longevity and reliability Versatile Industrial Use: Perfect for a range of applications including vibrating tables, filter screens, silo emptying, and bulk material compaction, enhancing efficiency in your operations 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