1、This hole opener has perfect holes, less burrs, sharpened and durable, and low working noise. It is a common tool for woodworkers and carpenters. 2、The maximum cutting diameter is 19mm, metal and non-ferrous metals cannot be drilled, otherwise the hole opener will be damaged quickly. 3、The use of super hard and thick alloy blade makes the blade of the hole drill more sharpened and durable, which ensures the long time usage. 4、The head of the drill bit body is designed with a curved curve, which is conducive to chip removal and high perforation efficiency. 5、Wide range of uses, this wood bit can be used for perforating wood products, such as installing ball-shaped door tips, drawer locks, etc. Item Type: Drill Bit Material: Alloy Total Length: Approx. 80mm / 3.15in Maximum Cutting Diameter: Approx. 19mm / 0.75in Usage: Perforation of Wood Products, Such As Installation of Spherical Door Tips, Drawer Locks, etc. Shank Diameter Shape: Round Handle 1 x Drill Bit