Uses: bicycle chain, magic buckle, chain connector. Gross Weight: 3g. 1 x Pair of Bicycle Ch ain Links. The two latter numbers on it stand for chain width. Quantity: 1 pair. Product size: 8 speed (6 \ 7 \ 8 universal): 20 x 7.1 x 5mm/0.79 x 0.28 x 0.20".