The DOT Durable screw studs are available in brass and stainless steel finishes. The screws are available in many types including wood, self-drilling, self-tapping and machine screw studs. The screw studs also come in many different lengths and the standards lengths are 3/8 inch (9.52 mm) and 5/16 inch (15.88mm), look for the corresponding screw information on the screw stud product specifications.