Feature: 1. Advanced powder platinum production technology with vacuum sintering can greatly increase the service life. 2. You can position at an oblique angle of 45 ° and drill in a vertical position. Meanwhile, it is noted that the rate cannot be too fast, and the rate should be slowly operated at about 800‑1000 rpm. 3. Hole opener can be used on bench drills, hand drills and drilling machines but not on impact drills, which means it cannot be opened with impact function. 4. Furthermore, such drill bits are suitable for all kinds of stone, ceramics, vitrified brick, glass, etc. And, you shall constantly add water to cool down while punching. 5. The segmented open hole design of the drill bit has a small cutting resistance and it is good for chip removal. 6. Universal triangle drill shank effectively prevents slipping during drilling and withstands greater torque. 7. All patterns have chip removal holes, and the oblong design is more conducive to chippings discharge. Specification: Item Type: Hole saw drill bitSize(Optional): Hole Opener Size Product Total Length Handle Length Handle Diameter Working Depth Approx. 65mm / 2.56in Approx.80mm / 3.15in Approx. 25mm / 1in Approx. 9.4mm / 0.4in Approx. 54mm / 2.13in Approx. 70mm / 2.76in Approx.80mm / 3.15in Approx. 25mm / 1in Approx. 9.4mm / 0.4in Approx. 54mm / 2.13in Approx. 75mm / 2.95in Approx.80mm / 3.15in Approx. 25mm / 1in Approx. 9.4mm / 0.4in Approx. 54mm / 2.13in . Package List: 1 x Hole Saw Drill Bit