Features1Robust Construction: Made of aluminum alloy, this bottom bracket is robust and durable for a long time of use, with optimal performance and maximum durability 2Smooth Trampling: Bicycle centershaft can ensure the smooth and stable stepping, reduce noise, providing a comfortable riding experience for you. 3Good Sealing Effect: Integral sealing, the lubricant is retained in the bearing, the dustproof and waterproof effect is good, suitable for harsh riding environment. 4Durable Structure: The bicycle axle has been subjected to precision manufacturing process and durability testing, and has a long service life, which is not easy to damage or malfunction. 5Applicable Bottom Bracket: The center shaft is fit for bottom bracket that has a inner diameter of 46mm, width of 79mm, please confirm the size before purchase.SpecificationItem Type:BicycleCenterShaftMaterial: Aluminum alloyFitment:Bottom Bracket Inner Diameter: Approx. 46mm / 1.8inBottom Bracket Width: Approx. 79mm / 3.1inCrankset Disc Axis: Approx. 30mm / 1.2inPackage List1 x BicycleCenterShaft