Colour: Black BCD: 104mm Tooth pattern: BC1.37-24T Material: 6061 aluminum alloy Length: 170mm Bottom bracket: threaded BB68/73mm weight: Crank about 700g Bottom bracket about 100g 34T chain ring about 52g 36T chain ring about 55g 38T chain ring about 70g The set includes: left and right cranks + chain rings + fixing screws (4 Pcs) +BB(68/73mm)+ gifts (1 pair of crank silicone protective sleeves in red) Features: 1. High-strength aluminum alloy material, CNC forged, improves strength and reduces weight. The weight of the left and right cranks is about 700g. 2. Compatible with 8/9/10/11/12 speeds, the chain ring adopts a narrow and wide tooth shape design, and the chain will not fall off. 3. 104/64BCD is compatible with 1x 2x 3x speed. 4. If the bottom bracket of your frame is threaded and the width is 68-73mm, it can be used with your bicycle.