A pair of Quick Link Connectors allows you to easily open and rejoin KMC chain without the need for tools. Choose either X9 or X10 depending on whether your chain is nine speed or ten speed. One pair is included in the purchase of Bulk KMC X9 Chain and in purchases of Bulk KMC X10 Chain. These Quick Link Connectors are sold as replacements or spares and are compatible with Shimano, SRAM and Campy.