1、The hole saw can be used on table drills, hand drills and drilling machines but not on impact drills 2、Suitable for all kinds of stone, ceramics, vitrified brick, glass, etc. You should always add water to cool down the holes 3、Advanced powder platinum production technology with vacuum sintering, greatly increasing the service life 4、The segmented design of the drill bit has a small cutting resistance and is good for chip removal. 5、Universal triangular drill shank can effectively prevent slipping during drilling and withstands greater torsion 6、All specifications have chip removal holes, and the oblong design is more conducive to chip discharge. 7、Position at an oblique angle of 45° first, and drill the hole vertically(note that the speed should not be too fast, and the speed should be slowly operated at about 800‑1000 rpm) Item Type: Hole Saw Drill Bit Optional Style: 40mm, 45mm, 50mm, 55mm, 60mm Opener specifications Total product length Handle length Handle diameter Working depth 40mm / 1.6in 83mm / 3.3in 25mm / 1in 9.4mm / 0.4in 58mm / 2.3in 45mm / 1.8in 83mm / 3.3in 25mm / 1in 9.4mm / 0.4in 58mm / 2.3in 50mm / 2in 84mm / 3.3in 25mm / 1in 9.4mm / 0.4in 59mm / 2.3in 55mm / 2.2in 84mm / 3.3in 25mm / 1in 9.4mm / 0.4in 59mm / 2.3in 60mm / 2.4in 80mm / 3.1in 25mm / 1in 9.4mm / 0.4in 59mm / 2.3in 1 x Hole Saw Drill Bit