Cat. I to Cat. 0 lower link pin. 7/8 inch diameter, 1-3/4 inch useable length, 4-1/2 inch overall length, 5/8 inch thread diameter with adjustable jam nut

Cat. I lower link pin. 7/8 inch diameter, 1-3/4 inch useable length, 5-1/2 inch overall length, 7/8 inch thread diameter with fixed shoulder

Cat. I lower link pin. 7/8 inch diameter, 2-1/2 inch useable length, 6-7/16 inch overall length, 7/8 inch NF thread diameter with fixed shoulder