Material Alloy 6061 crank high intensity steel chainring Bottom Bracket Width 6873mm BCD 104mm Crank Arm Length 170mm Crank Screw Aliber 15mm Hollow one sprocket wheel shaft for mountain bikes road bikes Compatible With Shimano FSA Gaint ATX770 ATX770D XTC 750 Package Include One fordged crank set bottom bracket 4 pcs single chainring bolts crank screw crankset bolt allen wrench chainring