Woodworking Countersink Drill Bits Set, 12 PCS Counter Sink Fitted With a 1/4 Inch Hex Shank for #4、#6、#8、#10、#12 Screws, Drilling Holes in Wood, Composite Panels, and Plastics

【Packing List】Includes five Woodworking Countersink Drill Bits measuring 2mm, 2.5mm, 2.8mm, 3.2mm and 3.5mm, complemented by ten interchangeable drill bits perfectly aligned for #4, #6, #8, #10 and #12 screw holes in both softwood and hardwood. A hex key, catering to diverse drilling requirements 【Unique Spiral Double Flute Design】Adopting a double flute cutting design , these countersunk drill bits stably reduce vibration , ensure a smooth surface and deliver high precision drilling . The double flute structure enables faster cutting speed and a finer finish than most standard drill bits 【High Speed Steel with Titanium Coating】Made of premium titanium coated high speed steel (HSS) , these counter sink drill bits feature high hardness and incisive cutting edges . The drilling , chamfering and countersink design with stepped bevel blades maximizes durability and minimizes cutting resistance 【1/4inch Hex Shank】Built with a standard 1/4 inch hex shank , this chamfer drill bit set is compatible with various impact drills , hand drills , bench drills and electric drills . The drilling depth can be easily adjusted for different applications 【Wide Application for Multiple Materials】Countersunk Drill Bits are suitable for hard/soft wood , wood board , plastic , soft metal , fiberboard , particleboard , plywood , aluminum alloy sheet and more . Ideal for professional woodworking and daily household DIY projects