General description Wood Countersink Woodworking Drill Bit set includes seven high-speed steel (HSS) bits designed for precise drilling and chamfering of pilot holes for screws ranging from 3 mm to 10 mm. The set features a unique 5-flute design that allows for efficient wood removal and smooth drilling, ensuring a perfect screw closure embedded in the workpiece surface. Technical specifications Material: HSS 4241 with titanium nitrate coating Chamfer drill dimensions: 3 mm (Diameter) x 60 mm (Length) 4 mm (Diameter) x 75 mm (Length) 5 mm (Diameter) x 85 mm (Length) 6 mm (Diameter) x 92 mm (Length) 7 mm (Diameter) x 100 mm (Length) 8 mm (Diameter) x 110 mm (Length) 10 mm (Diameter) x 120 mm (Length) Compatibility and accessories Includes hex wrench for adjustable depth Installation Adjustable drilling length for screws of different lengths by loosening and tightening the screw Usage Designed for woodworking drilling and chamfering of removable parts Can be used on wood, steel,