Race Face Cinch Direct Mount Round Ring. Features: 7075-T6 aluminum direct mount ring to fit Race Face Cinch system splined cranks Narrow-wide teeth prevent chain drop, updated tooth profile runs quieter Compatible with 9-12 speed chains, allowing a 1X set up on most any drivetrain Installs with a common Park BBT-22 tool Specs: Ring Type:single (anti-chain drop) Armx BCD:Cinch direct mount Teeth:28t Color:black