SHIMANO part no.: ESMUG51A. Shimano SM-UG51 6/7/8-speed Quick-Link Connector 2 pair. With the Shimano SM-UG51 Quick-Link connector, 6/7/8-speed chains can be easily mounted without tools. Pair (two pieces) Shimano 6/7/8-speed Connector Quick-Link SM-UG51.
