HSS Gold Cobalt Jobber Drill Bit For Stainless & Hard Steels. Drills 1mm - 10mm. - High Quality M35 Alloyed HSS steel with 5% Cobalt Content. Material: Cobalt High Speed Steel. 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.3mm, 3.5mm, 4mm, 4.1mm, 4.2mm, 4.5mm 5mm, 5.5mm, 6mm, 6.5mm, 6.8mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 10mm.
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