SQUARE BOX EXTENSION RING TYPE; PRE-GALVANIZED DRAWN STEEL MATERIAL; 4-11/16 INCH; 4-11/16 INCH; 1-1/2 INCH; UL APPROVAL; 25 STANDARD PACKAGE; 29.5 CU INCH CAPACITY; (8) 1/2 INCH SIDES, (4) 3/4 INCH SIDES KNOCKOUT SIZE; 12 KNOCKOUT(S); BOWERS[R] BRAND