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When unboxing a Time-Sert thread repair kit—such as the popular 1015 kit or other engine-specific thread repair sets—one of the first things technicians notice is the geometry of the cutting tools. Rather than featuring a fully round shank like standard jobber drill bits, Time-Sert drill bits, counterbores, taps and driver tools are engineered with square ends. This design choice is not accidental; it is a fundamental engineering feature designed to maximize torque transfer, improve …