We use these snaps on a variety of our pack saddles and tack. We use chrome-plated brass for its durability and because it will not rust. All of our hardware is of the highest quality. The snap size is determined by measuring the inside width; it will match the width of strap you want to use (ie. 1" leather strap will need a 1" snap). The ¾" snap is 3" in overall length. The 1" snap is 3¼" in overall length.