1. The Main Body Is Expandable And Compatible With a Variety Of Frame Types.2. Lengthening The Built-In Telescopic Rod Can Improve The Stability Of The Bike Center Of Gravity When Pushing, And It Is Not Easy To Tilt.3. Heightened Design, Don't Worry About The Small Diameter Of The Easy Wheel Causing The Shock Absorber To Scrape The Ground.4. It is made of aluminum alloy material and processed by CNC technology. The product is lightweight and has improved strength. Hollow design, exquisite workmanship, anodizedcolour: blackMaterial: aluminum alloySize: 138x50.5x22MMPackage Contents:2 x Easy Wheels Extension Bar4 x screw8 x gasket4 x wrenchOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.