System One AWW-4 Aluminum Work Winch (Set of 4) for System One Ladder Racks Tie Down The Work Winch is the most universal and easiest to use tie-down system ever made. Work Winches "plug in" to any System One I.T.S. series rack in 2 to 3 minutes. The body of the Work Winch is cast from 356 aluminum alloy and then heat treated A 7-1/2' x 1-1/2 polyester strap is used with our Work Winches because they have a higher tensile strength than nylon and undergo significantly less elongation in wet weather There is a vinyl coated hook on the end made from 3/8 tempered steel. Set of 4 Winches / Only rust free tie-down system made