1、The blade is of sharpness, add good‑quality diamond particles, which is not easy to be damaged 2、Adopt straight shank design, suitable for most hand electric drills on the market, with a wide range of applications 3、Large chip removal port design, realize convenient chip removal, safe and non‑splashing 4、Can be used for drilling marble, granite, concrete, artificial stone, pebbles and other materials 5、Covered with red coating, which is corrosion‑resistant and moisture‑resistant, very durable Item Type: Diamond Drill Bit Material: High speed steel, diamond Application: Drilling marble, granite, concrete, artificial stone, pebbles and other materials; widely used in home improvement, DIY hand-made and other scenes Equipment: Electric drill, bench drill Hole Diameter: Approx. 25mm / 1in, 28mm / 1.1in, 30mm / 1.2in Total Length: Approx. 83mm / 3.3in Shank Type: Straight Shank Color: Red 1 x Diamond Drill Bit