Boxes, General Purpose, Square, Appleton, Type: 4" with Nonmetallic Sheathed Cable Clamps, 1-1/2" Deep, Welded, plain vertical bracket, with green ground wire, Volume: 21 Cubic Inch, Type Clamp: CL-26, Sides Knockout: 2@1/2", Bottom knockout: 1@1/2", UL S