This is a set of Dubro Heavy-Duty Ball Links for use with 4-40 threaded rod. Black nylon link construction Brass swivel-ball construction Beveled brass swivel-ball stand-off Hex-Head machine mounting screw Two Heavy-Duty ball links w/brass swivel-balls Two beveled brass swivel-ball stand-offs Two 4-40 x 5/8" hex-head mounting screws Two #4 lock nuts (metal construction w/nylon insert) 3/32" allen wrench 1/4" open-end wrench or nutdriver Ball Link Length: 27mm (1.063") Standoff Height: 3.2mm (0.125") Also available in a set of twelve, use DUBQ0898. NNA 10/13/03 ir/jxs &