Bosch cobalt bits offer the best heat resistance and a rigid thick web design for drilling in extremely hard and abrasive materials such as stainless steel, cast iron and titanium. A tough cobalt alloy delivers up to 100°F for superior performance during extended periods of extreme heat. Overall bit hardness of 66-68 HRC allows these bits to penetrate the most resistant materials. 135° split point starts on contact with no skating and no centre punch is required.
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