SHIMANO Deore CS-M8100 Cassette Sprocket Adhesive Ring - (12-Speed) - Y0GX01500 Shimano Deore XT CS-M8100 12 speed cassette Adhesive Ring. For use with their 10-45T & 10-51T cassettes. The following are an "A" match which indicates that the parts are the same in materials, appearance, finish & size etc. - Shimano XTR CS-M9101 - Shimano SLX CS-M7100 - Shimano Deore CS-M6100 These cassettes require the Shimano TL-LR15 Lock Ring Removal Tool. Original Shimano parts guarantee that all components work perfectly for optimum performance and maximum safety and longevity.