The M12x1.5 female threaded stainless steel lug guide tool is for use with Corvettes and other vehicles which use M12x1.5 studs. The 1/2"-20 tools fit Mustang wheel studs through model year 2014. The M14x1.5 tools fit Camaros, 2015+ Mustangs, and other vehicles with M14x1.5 studs. Using at least two of the female threaded lug guide tools helps to avoid damaging the brake caliper, rotor, and wheel when installing a wheel on vehicles with big brakes. A minimum of two tools is recommended. Tools are priced individually. Choose quantity two (2) for a pair, or quantity three (3) for a 3-pack. Storage cases are included with tools.