ALPEN HSS COBALT DRILL BIT 4.5MM ALP623045HSS COBALT JOBBER DRILLS BITS Size: 4. 5 x 80 47 mm Packaged: Qty 1 Range of application: 5% cobalt alloyed jobber drills with high heat resistance for drilling steels with tensile strength over 800 N mm , specially suitable for high alloyed steels, bearing steels, hot cold rolled steel. Ideal for stainless steel. Strengths Self centering, due to a special point shaoe Drilling even with the highest thermal stress up to 600 Tensile strength over 800 N