Patented Drop-stop® Wide-narrow Tooth Profile For Minimised Dropped Chains,Perfect For 1x Setups,Machined In-house At Wolf Tooth\'s Hq In Minnesota, USA,.CompatibilityThese Rings Fit Any Sram 76 Bcd Spider Or Specialized Stout Crankset.,Threaded For Standard M8 Chainring Bolts. For The Xx1 Spider, We Recommend 6mm Bolts (Or Any Short M8 Chainring Bolt). For The Stout Crankset, We Recommend The 10mm Bolts Or The Bolts That Come With The Crankset.,For 1x9, 1x10, 1x11 And 1x12 Drivetrains (Including Sram Eagle)Compatible With All 10-, 11-, And 12-speed Chains Except Shimano 12-speed Chains.,If Using A 9-speed Drivetrain Use A 10-speed Chain (Shifts And Works Well On A 9-speed Drivetrain And Fits The Ring Tighter For Better Chain Retention).,..