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、Position at an oblique angle of 45 ° and drill in a vertical position (note that the speed cannot be too fast, and the speed should be slowly operated at about 800-1000 rpm). 2、The hole opener can be used on bench drills, hand drills and drilling machines but not on impact drills. (Cannot be opened with impact function). 3、Suitable for all kinds of stone, ceramics, glass, glass, etc., keep adding water to cool down the holes. 4、The hole opener adopts a segmented designed, which has a small cutting resistance and is conducive to chip removal. 5、Universal triangular drill shank can effectively prevent skidding and bear more torsion. 6、Dedicated hole for chip removal, long oval designed is more conducive to chip discharge. Specification: Item Type: Hole Opener Optional Models: 90mm, 100mm Opener Model54mm / 2.1in Package List: 1 x Hole Opener Package List 1 x Hole Opener