American ASA Roller Chain Split / Half Links (3/8'', 1/2'', 5/8'', 3/4'', 1'')

35-1 = 3/8" Chain Pitch. 40-1 = 1/2" Chain Pitch. 50-1 = 5/8" Chain Pitch. 60-1 = 3/4" Chain Pitch. 80-1 = 1" Chain Pitch.

eBay