Wolf Tooth Direct Mount Chainring - 28t Shimano DM For Boost Cranks 3mm Offset Drop-Stop ST Requires 12-Speed HG+ Chain BLKDesigned specifically for Shimano 12 speed HG+ chains Compatible with Shimano XTR M9100, XT M8100, and SLX M7100 series 12 speed cranksets Engineered proprietary tooth profile maintains the quiet and smooth performance of the HG+ drivetrain with legendary Wolf Tooth chain retention Prevents premature ring and chain wear that can come from non optimized profile Made in the USA from 7075 T6 aluminum alloy TECH SPECS model Drop Stop ST Direct Mount