Product Description Carlon super Blue ceiling box, 1 gangs, Non-Metallic sheathed cable clamp cable entry, 4 in diameter, 3 in depth, nail-in, bracket mounting, 25 cu-in capacity, PVC, Blue, UL listed, for fixture support up to 50 lb., masonry walls.. From the Manufacturer Ceiling Box; Round; New Work; 4-Inch Diameter; 3-Inch Depth; 25 Cubic-Inch Capacity; PVC Material; Blue Color; (2) Nail Mounting; For Use With Non-Metallic Sheathed Cable; UL Approval.