Arrow's Screw Snap Fastener Kit is a handy, easy to use kit that is perfect for attaching canvas, tarpaulins, tonneau covers, sailcloth and other interior and exterior fabrics to solid surfaces such as wood, plastic and fiberglass. The button caps are nickel plated with a 3/8 inch screw. The kit contains 6 sets of screw snap fasteners and a two piece setting tool.