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Original equipment rear derailleur pulleys for SRAM rear derailleurs. - NX/SX Eagle Rear Derailleur Pulley Kit

Power Links provide tool free chain assembly. - 8-speed width: 7.1mm - 9-speed width: 6.8mm - Chain Compatibility: SRAM - Reusable: Yes

These are the correct connecting links for SRAM's 12-speed Eagle chains. They are great for installing new chains and fixing chains on the road and trail, too. They come in a four pack, for use with four chains.