Carlon 2-1/4 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, Fixture Spacing for 2-3/4 Inches and 3 Inches. Suitable for fixture support up to 50 lbs.