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Custom Micro - grain carbide tips mortising TCT drill bits (16MM shank) Drill bits made of carbon steel and carbide tips. Steel body with heat treatment. to make sure strong enough and no broken. Surface painted with red (LH) or black (RH) color. We have Brad point, V point, for hinges and countersink different types. 10mm modular shank with flat. T.C.T tips with center point and M5*10 adjustable screw. Applications: Bits make through holes or blind holes or holes on hinges