[High quality] -- The bicycle rack is made of high-quality hard aluminum alloy, which is durable, can withstand more weight and is not easy to damage. It is equipped with stainless steel screws to help you ride freely on rainy or humid environments, keeping your bike dry and clean. [Cargoing capacity and unique design] -- The bicycle luggage rack has a maximum load-bearing capacity of 9 kg/20 pounds, which can help you easily transport luggage and use it with hanging baskets, backpacks, baskets, etc. The weight can increase accordingto the strength of the seat pole. In addition, the slightly raised tail and front flap design helps to keep the goods in place and prevent them from falling. And black is more resistant to dirt. [Simple installation and adjustable shelves] - Easy to replace and install on the seatpost of the bicycle rack. Easy to install with the included rubber pad and L-shaped wrench. It allows you to transport goods easily and efficiently, which is verysuitable for use with baskets, backpacks, baskets, etc. Installed on the bicycle pole, the adjustable mounting lever can be extended back/forward according to your needs. It is suitable for different bicycles and can be retracted for easy storage. [Almost suitable for bicycles] - This rear shelf is very suitable for long-distance cycling and excursions to accommodate enough daily necessities. It is suitable for most bicycles, such as road bikes, mountain bikes, fat bicycles, etc. The shelf is35cm long and 12 cm/4.7 inches wide, which is suitable for most bicycles with a calibre of less than 32 mm/1.3 inches. The mounting bracket is suitable for seat tubes with a diameter of 27.2-31.8 mm/1.1-1.3 inches.