Usage: Ideal for sinking 90 degree holes in wood and soft metals Countersunk screws and fasteners. With 6.35mm shank diameter and 20mm length can be driven with electric drill or battery. Unique Process: High quality non-slip wear-resistant ensures increased comfort and convenience, Surface Treatment: Blackening treatment Size: Commonly used Sizes including 12mm, 16mm and 19mm all with 1/4" hex quick change shanks, Angle: 90 degree. Five flutes countersunk countersink, Heat treatment: High frequency quenching, increase hardness Durable: High quality high carbon steel, durable and rustproof, long service life. Specification: Material: HSS Quantity: 3 Pcs Shank: 6.35mm (1/4") Size: Approx. 12mm x 43mm, 16mm x 43mm, 19mm x 48mm Surface Treatment: Blackening Treatment Applicable Scope: Suitable for Wood Plastic Chamfering Chamfering etc Features: Suitable for all wood and aluminum 1/4" Quick change hex shank Fits all hand and power drills Heat treated carbon steel blades ensure good service life Ideal for wood boards, fiberboard, particle board, plywood, plastic, aluminum panels, etc. to form holes Universally applicable, lowering and deburring without chatter Suitable for DIY, home and general construction development Ideal for sinking 90 degree holes in wood and soft metals in the preparation of countersunk screws and fasteners Set includes all commonly used sizes including 12mm, 16mm and 19mm, all with 1/4" hex quick change shanks for easy quick change with 1/4" quick chuck system Contents: 1 set of Peripheral Chamfer Drill Bit (3pcs) Quantity delivered: 3 pieces becomeveryrich