Every chain is only as strong as its weakest link - traditionally, the connecting link. In contrast, the PowerLink™ connection is just as strong and durable as every other link in the chain. It can be opened and closed as may times as you want without using any tools.
SRAM Powerlink Connector Features:
PowerLink means no weak links
NB: 2 pieces (2 parts of one chain link) and (3 parts of one chain link)
IMPORTANT: The 7,8,and 9 speed links have 2 sides and 1 spacer. 10sp/11sp & 12sp Links are POWERLOCK, they fit together but then are not designed to come apart again