AGPtek 1 Pair Quick Link Snap Hook Carabiner Connector Screw Lock Clip For Swing Play Set Premium-grade quick links for chain/rope,cable connections; threaded-nut closure for added security This Zink Plated Steel Carabiner has superior strength, excellent rust\corrosion resistance. Also it is great for fast connections with chains and trailer safety chains.Versatile binding, rigging and anchoring hardware allows fastest connection/disconnection Push gate in to open auto-close spring gate with interlock tooth prevents load forcing open This Snap hook allows you to attach two chains or cables without cutting. An easy-open threaded nut allows you to safety unlock and close without hurting yourself. All in all, safety is the priority! Lots of Uses. ( 37.4 mm, 93 mm, 15.4 mm)