ARP Wheel Studs GM Late Model, Pack of 5 # 100-7708Wheel Stud KitLate model GM M12 X 1. 50"Kit #: 100 7708 Specifications Knurl Diameter 0. 509? UHL 2. 500? Knurl Length 0. 315? Nose Length 0? Diameter Pitch M12 x 1. 5 Wheel Stud Hole Size Cast Iron Steel Hub 0. 493? 0. 503? Cast Iron Steel Hub Drill Bit Size (actual dim.) 1 2? (0. 500?) Wheel Stud Hole Size Aluminum Hub 0. 493? 0. 499? Aluminum Hub Drill Bit Size (actual dim.) 12. 5mm (0. 492?)