Thomas & Betts 2050-UB Single Gang Box With Nails Thomas & Betts 2050-UB Single Gang Box With Nails Features: Single gang reinforced Phenolic box Mounted by bottom nails included with order 150º C heat rated material Classified for two-hour firewall and fire-ceiling UL FiIe No. E11461 and R9140 No knockouts 3-9/16" x 2-1/4" x 1-13/16"