S2 Material Forging:The drill bit is made of high quality S2 alloy steel ,with sturdy hardened & tempered construction. 12 piece sae hex bits sizes include 1.5mm, 1.5mm, 2mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 5mm, 6mm, 7mm, 8mm.
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