Master link
![Figure 1: A traditional master link, compatible with straight chainlines and widely spaced sprockets.](/Images/godic/202501/26/Falsa_maglia2541.jpg")
![Figure 2: A SRAM Powerlink, joining two ends of a chain.](/Images/godic/202501/26/SRAM_Power_Link2542.jpg")
![Figure 3: A master link with a slightly raised profile. Note that the embossed arrow should point toward the inside of the chain-loop. Note also the more prominent pin excess.](/Images/godic/202501/26/High_profile_master_link2542.JPG")
A master link or quick-release link is a roller chain accessory that allows convenient connection and disconnection of a chain without the need for a chain tool. It acts as a set of the chain's outer plates, so joining two sets of the chain's inner plate ends. Such master links may or may not be re-usable. A chain tool is nonetheless needed to adjust a chain's length, for example to shorten a new chain before connecting its ends. They are used on bicycles and motorcycles.