Box - Hammond, Unpainted Aluminum, 5.3" x 4.4" x 1.5" 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. Designed to meet IP54.