The Clarke CHT931 99-Piece Cobalt Drill Set is manufactured from M35 steel for increased speed and effective cutting even at high temperatures. Each drill bit is finished with a 135° split point ideal for the cutting of sheet materials reducing the chance of the bit slipping during use the 5% cobalt content also makes the drills better at drilling in harder materials.We strongly advise that when drilling in steel and stainless steel that you use a cutting fluid and center punch when staPTDCLA1801932
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