NEW IN BLISTER PACKAGE Features: 1. Special designed steel counter sleeve countersinks or counterbores pilot hole. 2. Drilling length can be adjusted for various length screws simply by loosening and tightening the setscrew. 3. Chamfer is 5 flutes, In the process of using, can discharge the wood more rapid, sink hole disposable drilled smooth, screw cap perfect embedded in the surface of workpiece. ?PREMIUM QUALITY?Made with industrial grade high-carbon steel, great hardness provides sharp edges, high strength takes bits with superior cutting capactiy and durability. Ideal for household woodworking and DIY Projects. ?EFFICIENT DESIGN?3-point tricuspid ensures drill process accurate and fast, no offset, slip and bias during drilling; 2-spiral flute makes chip removing easy and efficient; 5-edged chatter-free chamfer cutter pedestal design makes countersink precise and smooth. All cutting edge are well hardened and honed for sharpness. ?MULTIPLE APPLICATION? Perfect for Wooden planks, Fiberboard, Particle board, Plywood, Plastic, PVC and soft metals. Suitable for hand drill, bench drill and electric drill. The drilling depth of countersink drill bits are adjustable by screws with various lengths; Meanwhile, their bits are removable for easy cleaning, sharpening,and replacement. NOT for hard metals or steel board ?SOPHISTICATED DESIGN?Extra straightening drill bit with exquisite countersink pedestal provide user a method of drilling a countersink hole with 1 time drill process.Extra straightening drill bit makes the drill hole accurate and smooth, exquisite countersink pedestal creates proper countersink structure with efficient experience. Specifications: Products: Countersink Drill Bit Material: High Speed Steel Coating: TiN Shank: Round Shank Size Including: 4pcs (3mm 4mm 5mm 6mm)+L-Wrench B01