1.Applicable to: The countersink drill bit set is suitable for chamfering boards, plastic boards, and other plates with low hardness2.Sharp and not deformed: The countersink drill bit set is It has a smooth and sharp cutting edge, 5 cutting edges can better remove chips, the cutting edge is not easy to deform, and the use is smoother. Hard material: The whole countersunk bit set is forged with superior carbon steel material, and the whole thing has high hardness, stable quality and good wear resistance after quenching treatment. The surface is plated to prevent rust. Overall thickening treatment 4. Shank Type: The countersink drill bit set comes with a standard 6.35MM (1/4 inch) hexagonal shank, suitable for a variety of hand drills, cordless drills and other tools5 . 5 Sizes: Countersink bit set comes in 1/4 inch, 3/8 inch, 1/2 inch, 5/8 inch, 3/4 inch, various combinations to meet the diverse needs of your job. CanSpecification:Item Type: Countersunk Drill Bit SetSize: 1/4 inch hex shankBlade Diameter: 1/4, 3/8, 1/2, 5/8, 3/4 inchesHow to use How to use:1. Drill the bottom hole with a tap2. Chamfer part on electric drill Install3. Tighten the screws flush with the horizontal surfacePacking list:Countersink drill bit x 5Storage rack x 1