Feature:*The four-piece set includes a drill bit for drilling pilot holes with dimensions of 3mm, 4mm, 5mm, and 6mm.*Specially designed steel countersink or counterbore pilot hole.*Use a wrench to adjust the depth of the secondary sleeve.*Drilling and countersinking wood screws without replacing the drill bit.*Just loosen and tighten the fixing screw, you can adjust the drilling length of screws of various lengths.*The chamfer is 5 blades, during use, the wood can be discharged faster,*The sink hole is drilled smoothly at time, and the nut is perfectly embedded in the surface of the workpiece.Description:*Color: as shown*Material: High speed steel + steel*Main material of black chamfer drill: Steel #45*size:3mm x 61mm (length)4mm x 75mm (length)5mm x 85mm (length)6mm x 91mm (length)*Chamfer diameter: 15.8 mm*Handle size: 1/4 hexagon handle.*Advantages: The chamfering machine is five-edged. In the process of use, it can expel wood chips more quickly, drill smooth and flat countersunk holes at time, and perfectly insert the screw cap into the surface of the workpiece.Packing list:4 * woodworking chamfer1 * hexagon handleNote:1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness.2. Please allow slight manual measurement deviation for the data.