Features: High-strength aluminum alloy material, made of aluminum alloy, light weight, stylish appearance, and strong compatibility. The shaft center chromium molybdenum steel improves the stability of the crank and the hollow shaft, and the performance is improved. Finished tooth pattern, using multi-stripe fixing method, make the crank force more direct. The internal weight reduction design makes the crank weight lighter. Hollow bearing bottom, BC1.37"X 24T hollow one-piece crankshaft, suitable for mountain bikes and most threads on the market. 68/73mm length frame bottom bracket, suitable for axle center 24mm crank. Specifications: Weight: Approx.675g Material: Aluminum Alloy BCD: 104mm Shaft Diameter: 24mm Color: Black/Blue/Gold/Purple/Red/Silver Note: 1.Please allow 0-3mm errors due to manual measurement. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1 Set Mountain Bike Crank