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+1 (217) 579-8045E-Z LOK 9/16-18 Tap DrillOur 9/16-18 taps operate in the same manner as standard taps, but produce an oversized thread specifically for E-Z Coil threaded inserts.During insert installation, the threads cut by this 9/16-18 tap drill form the E-Z Coil insert into the desired thread size. STI taps are ideal for tapping holes in softer metals that require a strong threaded insert.E-Z LOKs E-Z Coil 9/16-18 bottoming taps are manufactured from high speed steel (HSS) for superior durability. We offer STI taps in a wide range of inch, metric, and spark plug sizes to meet your unique requirements.