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I did not use the entire set to drill my three holes. Nope. I use my own bits, starting at a small pilot hole (difficult to keep large drill bit from walking). So, from 1/8" and in small increments, all the way up to 5/8". That was my largest metal drill bit. Pipe laying on grass, not rolling with my foot on top. Best Drill Bits for Metal for 2021 Pro Tool ReviewsDec 30, 2020 · Honestly, its not the fastest drilling bit that gets it our nod. It has to do with the use of M42 high-speed steel and its excellent case. Many less expensive cobalt drill bits use M35 steel which has a 5% cobalt blend. M42 steel uses an 8% cobalt blend. This gives it a greater hardness. It also lets you drill at higher speeds than M35.
CHTOOLS HSS countersink tool drill bit set, US $ 7.5 - 30 / Piece, Zhejiang, China, CHTOOLS, TCHX-3.Source from Zhejiang Xinxing Tools Co., Ltd. on . China 230PCS HSS Twist Drill Bit Set with DIN338 Standard China 230PCS HSS Twist Drill Bit Set with DIN338 Standard, Find details about China Drill Bit, Drill from 230PCS HSS Twist Drill Bit Set with DIN338 Standard - Jiangsu Goldmoon Industry Co., Ltd.
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