Strong Bite Force: The unique crocodile mouth design provides a strong grip, easy to engage, even ultra-thin fabric, not easy to fall off These would not create any kind of weakness or hole in a tarpaulin. Premium Material: These clips are made of industrial grade PA, durable, corrosion resistant and smooth surface, lightweight. Well made and strong enough. Convenient design: there is a hole at the end of the clip, suitable for attaching storm straps on the tent. Combined with a long length of elastic rope, no marks left on the fabric even if it is blown by the wind, built to last. Easy to use: screw lock structure, just tighten the screw, the clips will be well locked, tighten well. You can screw them onto the tarp or cover you are using, adjust the tightness with the screw. Widely Used: They can be used for a multitude of things. The clips can be used in awnings, caravans, tarps, boat covers, suitable for outdoor camping, picnic, sailing, tents, etc. They are quite strong and can last for a long time.