These Buckle and Handle Sail Ties are unique, no other sail tie is easier to use and are the highest quality sail tie on the market. The side-release buckle makes release a simple squeeze. To fasten, put the tie around the sail, snap the buckle together, grab the handle with one hand, the knob with the other, and pull tight. The knob makes accidental back-threading nearly impossible. Never again worry about threading a buckle in the dark or — heaven forbid — losing half the buckle! The buckle and the strap are Performance Matched to work perfectly with each other. All sewing is polyester/Dacron thread.