Zilco Quick release snap shackles for attaching traces to carriage. Sold individually Stainless steel 4" recommended for shetlands and small ponies 5" recommended for large pony, cob and full. You will need to have a closed loop style fastening on your carriage for using this shackle. If you have pigtails or curl hooks then please refer to Zilco Snap Shackle for Curl Hooks What is a Snap Shackle?As the name implies, a snap shackle is a fast action fastener which can be implemented single handed. It uses a spring activated locking mechanism to close a hinged shackle, and can be unfastened under load. Snap shackles are extremely useful in driving to make the traces to vehicle connection quick release. This is obviously very important in the event of an accident or to speed up putting to or taking out. Many modern four wheel vehicles have a solid ring or dee to attach the traces so a snap shackle is necessary to make this connection. /**/