1、The blade is of sharpness, good-quality diamond particles are added, which is not easy to be damaged 2、Straight shank design, suitable for most hand electric drills on the market, with a wide range of applications 3、Large chip removal port design, bring convenient chip removal, safe and non-splashing 4、Suitable for drilling marble, granite, concrete, artificial stone, pebbles and other materials 5、Covered with red coating, 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. 12mm / 0.5in, 14mm / 0.6in Total Length: Approx. 83mm / 3.3in Shank Type: Straight Shank Color: Red 1 x Diamond Drill Bit