Features： 1、[Smooth Operation] Can run smoothly, rotate smoothly, step on labor saving, easy to install and operate. 2、[Material] Made of high quality materials, the sprocket crankset is durable, lightweight, strong and has a long service life. 3、[Accuracy Cutting] Using accuracy cutting to ensure a fit to the bicycle, and compatible with many bicycle models. 4、[Anodized Treatment] The sprocket crankset is anodized, which is a good substitute for bicycle maintenance. 5、[Anti Deformation] Adopting sophisticated forging technology, the sprocket crankset is highly resistant to deformation. Specification： Item Type: Sprocket Crankset Material: Aluminum Alloy Crank Center: Approx. 170mm / 6.7in (the Distance Between the Centers of the Two Holes) 50/34T Full Length: Approx. 300mm / 11.8in 53/39T Full Length: Approx. 305mm / 12.0in Product Size: Leg Length: Approx. 215mm / 8.5in Shaft Diameter: Approx. 23mm / 1.0in Centre Shaft Length: Approx. 9.3cm / 3.7in Application: Suitable for Round Bottom Shaft, Pay Attention to the Shape of the Crank of the Original Car when Buying Package List： 1 x Crank 1 x Crankset 2 x Accessories 1 x Centre Shaft 2 x Washers