These heavy duty straps create a safe quick release connection from your D ring end of the traces to the curl hook on the swingle tree, used with a shackle as illustrated. (Please note the shackle is not included). We recently supplied these to a customer to specification, double nylon webbing approx 125mm long. All stitched with industrial nylon thread for strength and water resistance. Please note we can alter this or manufacture straps to your specification. In this listing you are buying a pair of straps. We have been manufacturing quality heavy duty straps / scuba diving products since 1999.