Features1Durable Material: Made of chrome molybdenum steel material, durable and long service life, high strength axes CNC process, surface grinding, smooth. 2Simple Operation: Simple to use, easy to install and disassemble. Without any difficult requirements even though you use it for the first time. 3Size Parameters: Length: 140mm/5.5in, hole diameter: 9.5mm/0.4in, please check the inner diameter of your old bottom bracket before purchasing. 4Scope of Application: Wide range of applications, suitable for road bikes and mountain bikes, suitable for most length matching bikes. 5Quality Assurance: Bicycle hollow shaft replacement, strict quality control and quality assurance, high safety factor, can be used with peace of mind.SpecificationItem Type: Front Hollow Shaft Color: As Pictures ShownMaterial: Chrome Molybdenum SteelWeight: Approx.133g/4.7ozLength: Approx. 140mm/5.5in, Hole Diameter: Approx. 9.5mm/0.4inPackage List1 xFront Hollow Shaft