The 1591EBG is a beige ABS plastic case and lid in the 1591E size, listed at 191 x 110 x 61 mm (7.5 x 4.35 x 2.39 in). It is a general purpose project box for vertically mounted printed circuit boards, useful to designers and OEMs who want a neutral-coloured housing for instruments, controllers and interface electronics.

The 1591E drawing lists the beige version in flame retardant ABS, and the part page gives a UL94 V-0 flame rating. Six M3-0.5 x 10 mm cover screws thread into pre-installed brass inserts, so the lid can be removed and refitted repeatedly; recommended torque is 35.5-42.5 ozf.in (25-30 cN.m). Lap joint construction guards against dust and splashing water, and the enclosure is designed to meet IP54.

The drawing gives inside dimensions of 183.52 x 103.53 x 56.60 mm (7.225 x 4.076 x 2.228 in) and a body of 190.40 x 110.60 mm. Card guides molded into all side walls accept 1.5 mm (0.062") boards, with a guide height of 51.60 mm; 1591Z adaptors allow horizontal mounting.

The 1591EBG weighs 0.54 lbs (0.24 kg), ships shrink wrapped, and is RoHS and REACH compliant. The 1591EC clear polycarbonate lid and 1599CLIP belt clips are listed as accessories for the 1591E.