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4" Square Conduit Boxes 4-11/16" Conduit Boxes   4-11/16" Boxes & Extension Rings 1-1/2" Deep 4-11/16" Extension Rings 2-1/8" Deep   4-11/16" Industrial Garvin Covers   4-11/16" Square Box Covers   4-11/16" Square Bracket Boxes Welded 2-1/8" Deep   4-11/16" Square Drawn Boxes 2-1/8" Deep   4-11/16" Square Mud Rings 1 Gang   4-11/16" Square Mud Rings 2 Gang   4-11/16" Square Tile Covers 1 Gang   4-11/16" Square Tile Covers 2 Gang   4-11/16" Square Welded Boxes 2-1/8" Deep   4-11/16" Swivel Fixture Hanger Conduit Body Electrical Boxes & Covers Handy Boxes Electrical Boxes & Covers Masonry Electrical Boxes & Covers Multi-Gang Electrical Boxes & Covers Octagon & Round Electrical Boxes & Covers Stainless Steel Electrical Boxes & Covers Switch Boxes Electrical Boxes Plastic Fasteners, Hangers & Clamps Fire Alarm / Emergency Boxes & Covers Fittings, Hubs & Bushings Fixture Whips & Grips GFCI--Ground Fault Circuit Interrupters Grounding Products Lighting & Lamps & CFL Bulbs Service Entrance Products Switches, Devices & Receptacles Tools & Install Accessories Wall Plates Weatherproof Boxes & Covers Aerial Drop Wire Hardware Beam Clamps Bridle Rings Bulk Wire & Cable Cable Management Distribution Rings Fire Prevention Products J-Hooks Jacks, Face Plates & Bezels Patch Cables Rope, Twine & Pulling Tape   4-11/16" Conduit Boxes: 4-11/16" Extension Rings 2-1/8" Deep 4-11/16” Square Extension Ring 2-1/8" Deep 1/2" KO's & 1/2" & 3/4" Concentric Knockouts 4-11/16” Square Extension Ring 2-1/8" Deep 1/2" KO's & 1/2" & 3/4" Concentric Knockouts allows for extra room to be added to an electrical box & can also serve as an outlet box for surface run conduit. Knockouts: (8) 1/2” & (4) Concentric 1/2” & 3/4” Cubic Inches: 29.0" Material: Steel 73171-S Call 866-770-4693 for details on volume discounts.