1. The reinforced grid adds a lot of ribs to the tray, which increases the bearing capacity of the tray, and it not easily loosen even if it is accidentally stepped on. 2. Universal wheel design This design can increase the mobility of large flowerpots, which can be very labor-saving and worry-free on the same plane. Can bear the weight of an adult. 3. Plug and play installation is very convenient, plug and play, no need to use a wrench to twist, when the wheel is not needed, it can also be removed at any time! 4. Universal wheel belt lock The universal wheel has a lock design to that the flowerpot not slide when placed on a smooth ground or a place with a little slope. 5. It can store water and breathe freely, and the edge of the wall is curled to that the tray is more firm and sturdy. The high wall design is beneficial to the storage of water in flowerpots. not overflow and cause leakage to the floor. Measurement method: First, determine the diameter of the pot bottom, and measure the diameter of the largest point, corresponding to the inner diameter of the tray. It is best to choose the inner diameter of the tray 1-3 cm larger than the bottom diameter of the flowerpot. Colour:Gray Material:Resin Size:Outer diameter 36cm Package Contents: 2 * flower pot tray Only the above package content, other products are not included. Note: Light reflection 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.