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Product Description M35 HSS-Co 5% Cobalt Material: Extra hardness & heat resistance, Rockwell hardness up to HRC67. Faster cutting speed, service life 12x longer than standard HSS drill bits. 135° Split Self-Centering Point: No walking, less pressure required for fast pen..

Product Description M35 HSS-Co with 5% Cobalt: Higher hardness & heat resistance, Rockwell hardness up to HRC67. Faster cutting speed, service life 12 times longer than standard HSS drill bits. 135° Split Self-Centering Point：No bit wandering, less pressure required for f..