The 300 Series wall cabinets are welded with center-section depths of 12" and 15", respectively. Basic model includes three, 16-gauge CRS sections which include a 2" deep, solid-steel front door, a 12" or 15" deep center section with adjustable mounting rails, and a 4-1?2" deep rear door. Panel space openings range from 7 RU to 35 RU. Enclosures are equipped with provisions for custom cabinet mounting, wire man­agement, equipment mounting, and structural support. Cabinet is finished in #962 black epoxy. All models include adjustable front rack rails tapped 10–32, and manufactured to standard E.I.A. 1?2" spacing. Models with RU openings of 16RU, 24RU and 35RU are equipped with center section mounting rail supports.