SXg Alloy Chain GuideFull-sized upper and lower guides with quiet, TPU co-molded innerNylon skid attached directly to integrated lower guideSwingset hardware allows guides to rotate apart for easy chain installationInstalls and adjusts with a single 4mm hexCompatible with chain lines 49mm and wider, including Boost 148Compatible with 1x7, 1x9, 1x10, and 1x11 drivetrainsItem SpecificationsChainguide Mount TypeISCG-05ColorBlack MRP SXg Alloy Chain Retention System UPC: 702430173742