Description 60 PITCH AND SMALLER ROLLER CHAIN SIZE, 1/2,5/8,3/8, BOLT HOLE MOUNTING SIZE. 1 WIDTH, 2-3/4 OD, -1/8 D, 3-1/4 FD, 1-5/16 FW. This item is a suitable alternative for the following: 2755FCB2, 2755FC1