Specifications:Product Name: Bike Bottom Bracket Cable GuideMaterial: Plastic + Metal screwsColor: BlackSize: 40x28mm/1.57x1.1 inchesFeatures:It is mainly used for the wiring of the transmission line under the bicycle frame, which can reduce the friction of the guide rail.Dual hole design, installation allows accurate alignment of cables with transmission.Easy to use, equipped with special screws, installed on the bottom bracket under the frame.It is an important component to guide the brake line and the transmission line between the front and rear transmission/brake system.The package includes:2 PCS Bike Anti Friction Bottom Bracket TubesAttention:1. Size and color are measured and photographed manually. If there is any error, please understand.2. Please purchase according to the specific size and model.