This is a 2-56 Swivel Ball Link Set with Hardware Brass, plastic, & steel construction One swivel ball links w/2-56 self-threading shank (.997" long) One 2-56x1/2" socket head cap screws (black) One 2-56 nut (Silver) One beveled spacer .084x.186x.081 (ID x OD x thickness) (brass) 5/64" allen wrench for socket head cap screws 3/16" wrench for the nuts See "includes" above tjt 032803 ir/kh &