Electrical Box Box Type Round Ceiling Pan Number of Gangs 1 Bracket Type Ad. 14-3/4 in to 22-1/2 in Capacity 20 cu in Material Polycarbonate Number of 1/2 in Back Knockouts 0 Number of 1/2 in Side Knockouts 0 Clamp Type - Nominal Depth 2 3/8 in Nominal Length 4 in Nominal Width 3 11/16 in Color Gray Standards File E104681 and R9320 UL Standard 514-C