Features APPLICABLE OBJECT: Countersink drill bit set is suitable for chamfer processing of board, plastic board and other plates with low hardness INCISIVE AND NON DEFORM: Countersink bit set has a smooth and incisive cutting edge, five cutting edges can better remove chips, cutting edge is not easy to deform, and the use is smoother HARD MATERIAL: Countersink bit set whole forged with excellent carbon steel material, the whole after quenching treatment, possess high hardness, stable quality, good wear resistance. Surface with plating treatment, rustproof. Overall thickening treatment SHANK TYPE: Countersink drill bit set come with standard 6.35MM(1/4in) hex shank, suitable for a variety of hand drill, charging drill and other tools 5 SIZES: Countersink bit set include 1/4in, 3/8in, 1/2in, 5/8in, 3/4in, a variety of combinations available to meet the diverse needs of job 1. APPLICABLE OBJECT: Countersink drill bit set is suitable for chamfer processing of board, plastic board and other plates with low hardness 2. INCISIVE AND NON DEFORM: Countersink bit set has a smooth and incisive cutting edge, five cutting edges can better remove chips, cutting edge is not easy to deform, and the use is smoother 3. HARD MATERIAL: Countersink bit set whole forged with excellent carbon steel material, the whole after quenching treatment, possess high hardness, stable quality, good wear resistance. Surface with plating treatment, rustproof. Overall thickening treatment 4. SHANK TYPE: Countersink drill bit set come with standard 6.35MM(1/4in) hex shank, suitable for a variety of hand drill, charging drill and other tools 5. 5 SIZES: Countersink bit set include 1/4in, 3/8in, 1/2in, 5/8in, 3/4in, a variety of combinations available to meet the diverse needs of job Specification: Item Type: Countersink Drill Bit Set Size: 1/4in Hex shank Blade Diameter: 1/4, 3/8, 1/2, 5/8, 3/4in How to Use: 1. Punch the bottom hole with a tap 2. Install the chamfer on the electric drill 3. Screw the screw so that is flush with horizontal plane PackageList: 5 x Countersink Drill Bits 1 x Storage Rack Package List 5 x Countersink Drill Bits 1 x Storage Rack