Made from heat treated, hardened steel - High Speed Steel. Available in packs of 10 - 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.2mm (1/8"), 3.5mm, 4.0mm, 4.2mm, 4.5mm & 4.8mm. Brand new in packet, made by BlueSpot tools, who offer a lifetime guarantee if you register your product, (please see their official website for details).
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