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The 35mm Concealed Hinge Bit makes it possible to bore clean, perfect holes for concealed hinges. The bit is a direct replacement for the bit that’s included in the Kreg Concealed Hinge Jig. For clean, fast cutting, the bit features four carbide cutters—two main cutters that bore a flat-bottomed hole, and a pair of spur cutters that ensure clean hole edges free of tearout.