This is a lug stud to fit aftermarket alloy and mag wheels. 12x1.25 thread pitch, approximately 45mm (1 3/4") overall length. Hex head for easy installation. These are good for use on steel wheels and aftermarket wheels with shouldered-style lug bolts. Not for use with alloy wheels and taper-seat "acorn" lug nuts. They are too short to give proper grip on the nut-side.