6pc Drill Bit Set HSS Co Cobalt 2mm - 8mm Heller twist drills set German Quality
6pc HSS-Cobalt Twist Drill Bit Set 2mm 3mm 4mm 5mm 6mm 8mm. Manufactured By Heller. Cobalt – Cobalt bits are a special formulation of high speed steel with cobalt added in to withstand very high drilling temperatures.