Feature:1. Aluminum Alloy Crank: The crank is made of high strength aluminum alloy, which is and does not break when stepped on.2. Good Features: The bike crankset has a stable structure, good compression resistance, thickened aluminum material, and is sturdy and durable.3. CNC Machining: Precise CNC machining improves strength and rigidity, and the is and without burrs.4. Lightweight Design: The left and right cranks are hollowed out in a large area, which greatly reduces the weight while maintaining the strength.5. Threaded Central Axle: High strength aluminum alloy, low noise, improved rigidity, and the sealing system is not easy to be damaged.Specification:Item Type: Folding CranksetProduct Material: Aluminum AlloyProduct Style: Hollow Crank Black (wth 5 Claws) and Central AxisBCD: Approx. 130mm / 5.1inAxle: Approx. 115mm / 4.5inColor: BlackWeight: Approx. 719g / 25.4oz Package List:3 x Crank Assembly1 x Central Axis2 x Tool3 x Screw5 x Steel Nail Assembly5 x Steel Nail Accessories