This chainring fit for 8/9/10/11 speed chain, fit JIANKUN(IXF) crank and Shimano M370/M410/M610/M670/M780 crank (not fit M7000/M8000/9000). Fit SRAM/FSA/Prowheel 104bcd crank. Chainring : Brand: BUCKLOS Material: 7075-T6 Aluminum alloy,Titanium plating Size: 30T,32T,34T,36T,38T,40T,42T Compatibility: 8,9,10,11 speed chain Bolt Center Diameter: 104mm BCD Thickness: 4mm Shape: Round/Oval Color: Multicolor/Black/Red/Blue/Green/Purple/Gold Round Weight: about (38g)/32t,(50g)/34t,(57g)/36t,(70g)/38t(88g)/40T(102g)/42T Oval Weight: about (40g)/32t,(49g)/34t,(59g)/36t Fit for MTB Bike,XC/Off Road/AM bike modified single chainring. Bolts description: Brand: Litepro Material: Aluminum alloy Specification: 6.5mm Weight: 5.4g/pc,approx Color:Multicolor/Black/Red/Blue/Green/Purple/Gold Fit:Single Sp.