Active boaters know that attaching and removing a boat cover or boat top is seldom easy. Fabric shrinks, snaps corrode, and aligning snaps can quickly become a two-person job. The Top-Snapper blade slides over the snap, allowing you to align the snap halves for easy snapping. The longer blade is for fastening snaps from the inside; the shorter blade for fastening snaps from the outside. Both blades work equally well for unsnapping snaps.