Asymmetrical tooth shape for the best wear life, chain retention and mud clearance - Fits SRAM and other 3-bolt direct mount cranks Dished ring provides 50mm chainline on GXP or BB30 / PF30 long spindle (with15.4mm drive side spacer) Drop-Stop B is with 10/11/SRAM 12sp chain and Flat-Top T-Type SRAM Eagle Transmission chains. Not compatible with Shimano 12 speed Made in the USA from 7075-T6 aluminum alloy 65g (30t) TECH SPECS ring type single (anti-chain drop) mount 3-bolt DM 3mm offset teeth 32t oval/round round color black