Diecast Aluminum Enclosures, Series 1550 Hammond Manufacturing's 1550 Series Diecast Aluminum Enclosures are tough, but yet easy to machine, electronic instrument enclosures. Lap joint construction provides protection against access of dust and splashing, as well as provides for improved EMI/RFI shielding. The unpainted versions have no sharp edges and the black versions are painted only on the exterior. The Hammond Enclosures 1550 Diecast Aluminum Enclosures meet IP54.