Prime-Line Products N 6729 Prime Line N6729 Top Pivot/Guide Pin, 3/8, 5/16 in Cap L, 1/4 in Dia Rod, Steel, 5-5/8&quot, Mill 3/8in. O.D. nylon cap 1/4in. O.D. x 5-5/8in. steel pin Includes coil spring and spring retainer For steel frame bi-folding doors