30pc Screw-In Snap Stud Replacement Kit with Tools - Boat Covers, Canvas Premium-grade replacement fasteners with setting tools; made in Taiwan Brass & steel with corrosion-resistant bright nickel finish for outdoor and marine applications for maximum protection from elements Galvanized steel stud screw with Phillips head, #8 x 5/8" length. Screw into wood, fiberglass, metal. Set of 6 studs with screws and 6 each socket and cap, galvanized steel mandrel and anvil make it easy to crimp center stud. Each kit can replace/provide up to 6 missing or broken snaps on boat and RV covers. See below for size and dimensions