Description: Made of reinforced stainless steel, tested load can up to 50kg. Adjustable main clamp fits most bike seat post stem. 2 triangle shape side bars prevent frame pannier bag touching wheels . Support bar is flexible and telescopic, can quickly adjust the height. Scientific proportion design is more stable. Specification: Material: Aluminium alloy Main Rack Size(LxW): Approx. 35x14cm/13.8x5.5inch Detail size reference attached picture Package Includes: 1 Set Bike Rack with Installation Accessories