Hammond 1590G Diecast Aluminum Enclosure -- Inches (3.9" x 2.0" x 0.9") mm (100mm x 50mm x 24mm) Rugged, diecast aluminum alloy (tough - yet easy to machine), electronic instrument enclosure. Inches (3.94" x 1.97" x 0.83") mm (100mm x 50mm x 21mm) Lap joint construction provides protection against access of dust and splashing water. Also provides for improved EMI/RFI shielding. Designed to meet IP54 (or IP66 if gasket is also purchased)