Shimano SM-UG51 Quick-Link for 8/7/6 Speed 2 PackThe Shimano SM-UG51 Quick-Link is compatible with current 8/7/6 speed chains. These are easy to connect and can be assembled without a tool. Can be used with TL-CN10 quick assembly tool that is sold separately. These links are non reusable. Set of 2 pairs.689228749375