HSS cobalt drill bit set. Suitable for drilling steel, stainless steel, aluminium, copper etc. 5% cobalt drills (this is the standard content for most cobalt drills). • 1.5mm, 2mm, 2.5mm, 3mm, 3.2mm, 4mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 6mm and 6.5mm.
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