ITEM: #3012 3" Ceiling Box Volume: 20 cu.in. Size: 3.5" Dia x 2.85"D UL Standard Certifications UL 514C 3rd Ed. - CAN/CSA 22.2 NO. 18-98 Product Features Fan Rated at 35 lbs. Supports metal brackets with screws Speed Anchor System for Cheetah Lamp Holders Re-enforced Nail Sleeves High Strength Polycarbonate Composite