Carlon 2-5/16 in. Round 1 Gang Ceiling Box - Volume 20 Cubic Inches, Diameter 4 Inches, Depth 2-1/4 Inches, Color Blue, Material Polycarbonate, Mounting Means Captive Nails, with Ground Lug and Screw Attached. Non-metallic box feature a rugged polycarbonate construction to withstand extreme temperatures.