Install in 4 Corners: you can get 4 packs of white grow tent corner shelves in the package, enough for you to install in 4 corners, after installation, you can place hygrometer, thermometer or camera on the shelves Size Information for Right Application: the mounting grow shelf measures about 3.5 x 3.5 x 1.32 inches, suitable for 16 mm grow tent poles, proper and right size makes it easy and convenient to install; Please confirm the size of your tent poles are 16 mm for right application before purchase Simple and Practical: our grow tent shelf is easy and effortless to use, simply force the notches into the tent pole, then it will be firm and stable enough, and also, you can adjust it back and forth in order to find the most proper placement angle Hard to Break: the clamp pole shelf is made of quality PP material, which is wear resistant and hard to break, has a long service life, combined with enough firmness and stability after installation, you can place a variety of items on it with confidence Multiple Functions: the camera corner shelf is very suitable for planting room, which not only allows you to put hygrometer, thermometer or camera, but also can be applied to hold diverse small items, as a potted plant rack and so on