1、Can drill multiple short chips during drilling, and the internal cooling system can be used to safely remove chips, which is conducive to the continuity of work. 2、The hole is made by drilling with high smoothness, and the tolerance range is small, which can replace part of the rough clock knife. 3、The use of drilling technology can not only reduce drilling tools, but also because of the way the head is inlaid with cemented carbide. 4、The service life of this CNC drill holder is ten times longer than that of ordinary drill bits. 5、Made of hard alloy material, high hardness, sturdiness and durability, anti-oxidation. 1 x U Drill Shank1 x Screwdriver1 x User Manual Item Type: Chamfering Drill ToolSpecification: C25-2D20-43WC03 (20x2 times the diameter)Material: CarbideOuter Edge Angle: 45°Straight Handle Thickness: Approx. 25mm / 1inDiameter: Approx. 20mm / 0.8inBlade Diameter Length: Approx. 40mm / 1.6in43: Represents the effective processing depth