The Viagrow DWC hydroponic veg lid is a heavy duty wide lip bucket lid with four three inch mesh pots. The vegi bucket lid is designed to fit on standard 3.5 Gal. and 5 Gal. buckets and has an easy on and off ability . The Vegi lid has four 3 inch net cups that are great for all hydroponic and container gardening growing applications as the mesh pot creates ample aeration for root development and deters weeds. In addition, the black opaque plastic will keep light out thus preventing algae from growing in your growing chamber. For ideal results use VS2 or VS10 Viastone grow rocks as your media in hydroponic applications. Will fit standard 3.5 Gal. and 5 Gal. buckets The four Mesh pots are 3 inches. wide x 3 inches deep and there are 4 pots in the lid. Overall dimensions are 12 in. in length x 12 in. in width x 3inches deep Sturdy and easy to clean, with easy on off lip Black opaque plastic keeps light and algae out.