Box - Hammond, Unpainted Aluminum, 4.37" x 2.37" x 1.22" Depth Rugged, diecast aluminum alloy (tough yet easy to machine), electronic instrument enclosure. Lap joint construction provides protection against access of dust and splashing water. Also provides for improved EMI/RFI shielding. Vibra finished for a smooth surface with no sharp edges. Four 6-32 x " machine screws secure lid - into tapped holes. Low side wall draft angle (2 degrees or less) for easy P.C. board mounting.