Clipped Head Serrated Lug Studs by Dorman®. Thread Size: 1/2″ x 20. Overall Length: 2-1/4″. Knurl Diameter: 0.619″. Shoulder Length: 0.652″. Handling: Right Hand Thread. Packaging Type: Box. Package Quantity: 10 Pieces. Wheel Bolts by Dorman. When it comes to your wheels, don’t take chances. Dorman’s Wheel Studs are produced to strict engineering quality standards. An engineers design these parts with tight tolerance on specific part characteristics to ensure proper fit and function, this design provides assurance your wheels will be tight every time they are removed and installed.