Hammond Manufacturing has introduced enhanced versions of its 1591 line of small enclosures. Designated the 1591XX, the new range is available in seven sizes from 3.4 x 2.2 x 1.4 in., 87 x 57 x 36 mm to 8.7 x 5.9 x 2.3 in., 221 x 150 x 60 mm. The new cases are optimized for mounting horizontal PCBs; units have four stand-offs molded into both the top and the base. The original 1591 series featured slots in all sides for mounting PCBs vertically, the updated version has plain sides, making connector installation easier. The lids, available as plain or flanged versions, fit to the base using a tongue and groove construction to give protection against dust or water; the enclosure is rated at IP54.