Hammond 1590MGY Grey Diecast Aluminum Enclosure with P.C. Board Mounting Ribs - Inches (4.48" x 2.49" x 1.06") mm (112mm x 62mm x 27mm) Rugged, diecast aluminum alloy (tough - yet easy to machine), electronic instrument enclosure. Inches (4.48" x 2.49" x 1.06") mm (112mm x 62mm x 27mm) 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) Integral card guides cast into all four (4) sides - accepts 1.5 mm (0.062) thick P.C. cards