Hubbell Electrical Products Square Box - Steel 193

WELDED TYPE 0.0625 INCH PRE-GALVANIZED STEEL MATERIAL 4 INCH 4 INCH 1-1/2 INCH UL 514A, CSA C22.2 APPROVAL B BRACKET FLUSH, CEILING/WALL MOUNTING 25 STANDARD PACKAGE 21 CU INCH CAPACITY (3) 1/2 INCH CONDUIT BOTTOM, (2) (1/2 INCH - 3/4 INCH) CONDUIT THREADED KNOCKOUT BOTTOM, (9) 1/2 INCH CONDUIT SIDES, (3) (1/2 INCH - 3/4 INCH) CONDUIT THREADED KNOCKOUT SIDES KNOCKOUT SIZE 17 KNOCKOUT(S) (5) BOTTOM, (12) SIDES KNOCKOUT LOCATION HUBBELL., RACO. BRAND APPLICABLE STANDARD ANSI, NEMA OS1 APPLICATION INSTALLED IN WALLS OR CEILINGS FOR LIGHTING FIXTURES, SWITCHES OR RECEPTACLES