Key attributes: Product name: Mazar aluminum box bracket Material: metal matte Size after folding is 21cm*27cm. Expand to a height of 21cm and a length of about 47cm. Suitable for boxes of 30 liters to 50 liters. 1. Please note that due to lighting effects, display brightness/contrast settings and other reasons, the tone of photos on the website may be slightly different from the actual items. 2. There may be a difference of 1-3 cm in the manual measurement items, and your understanding will be appreciated.