Hammond Manufacturing introduces enhanced versions of its well-established 1591 family of small enclosures. The 1591XX is available from 3.4" x 2.2" x 1.4" (87 x 57 x 36 mm) to 8.7" x 5.9" x 2.3" (221 x 150 x 60 mm). The new cases are optimized for mounting horizontal PCBs; they 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, but the updated version has plain sides, making connector installation easier. The lids are available as plain or flanged versions, and fit to the base using a tongue and groove construction to give protection against dust or water; the enclosure is rated at IP54. The flanged lids can be used to secure the enclosure to a wall or other surface; they have the additional benefit of providing security against casual disassembly as the lid screws are rendered inaccessible. The lids are secured using M3 screws into brass inserts in the base, and are ideal for applications where repeated access to the housed electronics is likely to be required. The cases are available in black, gray, or translucent blue ABS plastic with an attractive satin textured finish.