Dekorra Products Replicated Rock, 30-Inch by 23-Inch by 18-Inch, Fieldstone Grey Durable, UV protected will not fade in the sun or crack in cold weather; Commercial grade construction stands up to elements IDEAL CONCEALING APPLICATIONS: Small residential pump systems or backflow devices; Irrigation valve box lids and vaults; Septic aeration pumps or compressors; Well & septic pipes up to 12" H Lightweight, easy to move, very durable Overall Dimensions: 30" L x 23" W x 18" H (See inner dimensions on chart in image as rocks taper) RealrockTM material provides the realistic rock features; Color may vary slightly from one rock to the next.