SQUARE BOX EXTENSION RING TYPE; PRE-GALVANIZED WELDED STEEL MATERIAL; 4-11/16 INCH; 4-11/16 INCH; 2-1/8 INCH; UL APPROVAL; 25 STANDARD PACKAGE; 42 CU INCH CAPACITY; (8) 1/2 INCH SIDES, (4) 3/4 INCH SIDES KNOCKOUT SIZE; 12 KNOCKOUT(S); BOWERS[R] BRAND