Carlon 3-5/8 in. Rectangle Old Work 1 Gang Outlet Box - Volume 18 Cubic Inches, Length 4.30 Inches, Width 2.56 Inches, Depth 3.64 Inches, Color Blue, Material PVC, Mounting Means Mounting Ears and Swing Clamps. Largest wire fill capacity in their class. Will not crack or break in extreme environments. Resists flexing, hold their shape. Molded-in flanges and clamps. Faster installation. Noncorrosive and nonconductive. Listed for masonry walls.