These Toaster Cord Locks are made of high-strength Acetal plastic and are designed for exposure to the elements and temperature extremes. They fit cordage up to 1/8" and are ideal for parachute Cord. Because of the oval shaped hole you can actually thread two pieces of parachute cord through the hole alongside each other. Great for lanyard tie-down and one-hand adjustment, you will find many uses for them. Once you thread your cordage through the opening, all you have to do is pinch the cord lock tight to activate the spring. Package contains 6 cord locks.