Narrow/Wide oval chainring. CNC’d out of 7075 T-6 aluminum for durability. Cut from 0.313” thick aluminum plate for lightweight and strength. Features an Ovality of 12-13% with a Timing of 115º after TDC (Top Dead Center). Designed specifically for use with Shimano XT M8000 Cranks. For use with 9, 10, 11, or 12 speed drivetrains.