Mesh bucket lids are great for a variety of hydroponic and growing applications. They are designed to snugly fit the top of a standard 3.5 or 5 gallon bucket and work great for deep water culture and other types of systems. Featuring an extra sturdy lip and heavy duty construction. Mesh on bottom and all sides allows for maximum aeration and drainage. Works great with Hydroton clay pebbles, rockwool, and other types of media.