1、The cut design is used to ensure chip removal and sharpness during operation, saving time and more efficiently. 2、Thicker sand layer and uniform plating layer, improve the wear resistance and life of the hole opener. 3、Glass drill bit, made of alloy steel, anti‑corrosion, fine workmanship, super wear‑resistant, durable. 4、Large clearance hole,hole facilitates the entry of cooling water and escape of chips or other particles from the hole. 5、Wide range of applications, can be used for drilling of glass, ceramic tiles, floor tiles, marble, vitrified tiles, etc. Item Type: Glass Drill Hole Opener Material: Alloy Steel Total Length: Approx. 55mm / 2.2in Diameter: Approx. 85mm / 3.3in Working Depth: Approx. 30mm / 1.2in Shank Diameter: Approx. 10mm / 0.4in 2 x Glass Drill Hole Opener