Meter stack mounting rail, Wall mounting rail, 1MP, 1MM, 3MM, 35MM, and 37MM modular metering stacks General specifications Product Name meter stack mounting rail Catalog Number 1MMWB Product Length/Depth 48 in Product Height 0.05 in Product Width 1.5 in Product Weight 1.6 lb Certifications UL Listed Catalog Notes Rails are 4 feet (1.2m) in length. Bolted on wall for stacks, packs and mains to be hung.