Feature:1. Using advanced production technology and selected materials, strong and durable, has a long service life.2. The cutting resistance is small, the drilling speed is fast, and the chip removal is easy.3. Can be used for all kinds of wooden crafts, wood, plastic and other opening materials.4. This product is easy to install and easy to use, just install it on the electric hand drill.5. Using unique spiral grooves and hex handle design, and with low working noise.Specification:Item Type: Hole Saw Drill Bit SetProduct Color: OrangeProduct Material: Cemented carbideShank Diameter: Approx. 6.35mm / 0.3inTotal Length: Approx. 130mm / 5.1inProduct Size: Approx. 16mm / 0.63in18mm / 0.71in19mm / 0.75in20mm / 0.8in22mm / 0.9in25mm / 1inDrill Bit Length: Approx. 13cm / 5.1in19.5cm / 7.7in.Package List:6 x Hole Opener1 x Connecting Rod2 x Adapter1 x Storage Box