PROGRIP 907040 Shark Clip with Screw for Tarp, Camping and Cargo Tie Down Extension (Pack of 4) Clip with clamp down application and opening for hook used to aid in holding down material such as tarps, boat and auto covers, temporary shelters, or any fabric cover needing extra hold down points Ideal for commercial use such as construction, truck and vehicle owners who frequently transport cargo, as well as recreation use such as camping, hunting, and fishing where a tarp cover is used Tarp clip is constructed of durable plastic material with strong holding power, designed to last To use, slip material between clamp ending and twist shark fin on top to screw clamp and secure in clip; open ending with opening for hook creates additional anchor point to hold down material Shark Clip with Screw for Tarp, Camping and Cargo Tie Down Extension comes in grey, pack of 4