1The hole saw can be used on table drills, hand drills and drilling machines but not on impact drills 2Suitable for all kinds of stone, ceramics, vitrified brick, glass, etc. You should always add water to cool down the holes 3Advanced powder platinum production technology with vacuum sintering, greatly increasing the service life 4The segmented design of the drill bit has a small cutting resistance and is good for chip removal. 5Universal triangular drill shank can effectively prevent slipping during drilling and withstands greater torsion 6All specifications have chip removal holes, and the oblong design is more conducive to chip discharge. 7Position 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\n Optional Style: 40mm, 45mm, 50mm, 55mm, 60mm \n \n \n \n \n \n \n Opener specifications\n | Total product length\n | Handle length\n | Handle diameter\n | Working depth\n ---|---|---|---|--- \n \n 40mm / 1.6in\n | 83mm / 3.3in\n | 25mm / 1in\n | 9.4mm / 0.4in\n | 58mm / 2.3in\n \n \n 45mm / 1.8in\n | 83mm / 3.3in\n | 25mm / 1in\n | 9.4mm / 0.4in\n | 58mm / 2.3in\n \n \n 50mm / 2in\n | 84mm / 3.3in\n | 25mm / 1in\n | 9.4mm / 0.4in\n | 59mm / 2.3in\n \n \n 55mm / 2.2in\n | 84mm / 3.3in\n | 25mm / 1in\n | 9.4mm / 0.4in\n | 59mm / 2.3in\n \n \n 60mm / 2.4in\n | 80mm / 3.1in\n | 25mm / 1in\n | 9.4mm / 0.8in\n | 59mm / 2.3in\n \n ----------------------- 1 x Hole Saw Drill Bit