Fittings for 500 and 700 one-piece surface metal raceway Base has 1/2-in and 1-in concentric trade size knockouts and a 1-13/16 x 1-7/8 rectangular knockout to permit mounting on a one gang in-wall outlet box Two gang Box bases have a number 8-32 tapped hole for use with a ground screw White 4-3/4 width 1-3/8 depth 4-3/4 length Carded