Description of π HUAZHICHUN Combined Spiral Thread Counter
This drill bit set includding -1/8" (3.175mm), 5/32" (3.97mm), 3/16" (4.76mm),1/4" (6.35mm), 5/16" (7.94mm), 3/8" (9.53mm). Self-centering point, do not need assistant center drilling or center punching. Drilling and tapping in one, one-step processing, greatly save processing steps and time costs, improve working efficiency. High hardness, rustproof, solid and durable.Suitable for drilling, tapping, cutting on soft metal, aluminum plate, iron, etc. Great for fast drilling, tapping,etc. And Fast replacement composite cone, uses drill edged principle. It ensures a longer service life from your bits.