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Description: - Use high strength AL7075 aluminum alloy with high quality CNC machined super light. - Used on tubes inside the frame can effectively prevent chain and chain jumping. - Made of solid aluminum alloy with high hardness and long service life due to its small and light, strong and durable material. - Novel hollow design, lighter weight, anti chain effect, use for single disc sprocket, make your ride smooth and easy. - Universal chain stabilizer can be adjusted with a wrench without disassembling the crank. Bottom Bracket Chain Stabilizer need to remove the bottom bracket and crank when installing the bottom bracket chain stabilizer. Specifications: - Material: Aluminum Alloy - Size: - & Phi; 35mm-31.8mm/1.37-1.25" (or E-type installation mount) Package Includes: - 1 Piece Chain Guide - 4 Washers - 1 Piece Frame Protector Note: - Color may vary due to the color calibration of individual monitors. - Please allow slight measurement deviation due to manual measurement.