Description: Mountain bike chain ring universal and bottom bracket chain guide. It can guide the chain and protect the chain, effectively prevent chain drop and chain jump, used for single-piece flywheel, driving more smoothly Made of aluminum alloy, it features high hardness,can be used for a long time. It is used for single-disc sprocket, using it can make the ride smoother, providing you a good riding experience. The universal chain stabilizer can be adjusted with a wrench without disassembling the crank; The bottom bracket and crank need to be removed when installing the bottom bracket chain stabilizer Suitable for mountain bike to use, it designed with compact size and is lightweight, the surface is smooth and burr free. Specification: Material: Aluminum Alloy, Nylon Color: Black, Red Size(LxWH):Approx. universal: 806025mm/3.15x2.36x1inch Axis: 1055520mm/4.13x2.17x0.79inch universal application: 31.8-34.9mm/1.25-1.37inch standpipes Axis application: threaded BB bottom bracket, compatible with 30-40T disc teeth (press-in type is not currently supported) Package Includes: 1 Piece Chain stabilizer 2 Pieces installation tool Note: Color might be slightly different due to the color calibration of each individual monitor. Please allow slightly measuring deviation due to manual measurement.