Can be used to drill out broken bolts, studs, taps and drill bits. If you're drilling through hardened steel, you'll want to use a cobalt drill bit. Carbide Tipped Drill bits for hardened steel. These premium quality drill bits and sets will last
longer and cut truer than lesser quality bits. 135 split joint begins drilling immediately, minimizing bit walk. Hardened steel is a term for high or medium
carbon steel that received quenching treatments and then had ample tempering. See more detail at http://drill.bit.for.hardened.steel.bestcheaphanddrills.com
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