Features 1、Aluminum Alloy Crank: The bicycle crank is made of high strength aluminum alloy, which is wear resistant 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 surface is smooth and sharp 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. Item Type: Folding Bicycle Crankset Product Material: Aluminum Alloy Product Style: Hollow Crank Black (wth 5 Claws) and Central Axis BCD: Approx. 130mm / 5.1in Axle: Approx. 170mm / 6.7in Color: Black Weight: Approx. 719g / 25.4oz Package List 3 x Crank Assembly 1 x Central Axis 2 x Tool 3 x Screw 5 x Steel Nail Assembly 5 x Steel Nail Accessories