BCH-01 - SINGLELINK Closing link compatible with BBB single speed & 1-7 speed internal gear hub chains. BCH 08 - SMARTLINK II (8 Spd) 7.3mm, closing link compatible with BBB 8-speed chains. 1x per card BCH-09 - SMARTLINK II (9 Spd) 6.6mm, closing link compatible with BBB 9-speed chains. 1x per card BCH-10 - SMARTLINK II (10 Spd) 5.8mm, closing link compatible with BBB 10-speed chains. 1x per card BCH-11S - SMARTLINK II (11 Spd) 5.5mm, closing link compatible with BBB and Campagnolo 11-speed chains. 1x per card