Aluminum Alloy Material - Suitable for most bicycles, Such as road bike, mountain bike, fat bike, etc. . Come with tools and installation instruction, Easy to install. The Rack body is adjustable in size. Dimension - Shelf Length 55 cm, Width 14.5 cm; Panel Length 35.5 cm; Width 14.5 cm. (Seat Tube Diameter 2.2-3.3 cm / 0.85-1.3) adjustable for kinds of bikes. Easy to Mount.It is perfect for use with panniers, backpacks, baskets, and more [UNPACK] - 1 x Rack Body, 6 x Support Bar, 7 x Screws, 2 x Rubber Gasket, 2 x Form Gasket, 1 x Reflector, 1 x Install Instruction, 1 set x Installation tool ,1 x Keychain (Gift) NOTE: Come with the installation tool if not received please contact us reissue. Safety - Red rear reflector increase visibility on the night cycling to ensure your night cycling safety. 110Lb Capacity Almost Universal Adjustable Bike Cargo Rack, made of aluminum alloy material, Shelf Length 55 cm, Width 14.5 cm; Panel Length 35.5 cm; Width 14.5 cm.