Featuring fully ventilated bottom and sides for heat dissipation, these fully welded, easy-to-install shelves fit all components up to 17 3/8" wide to quickly meet all of your rackmounting needs. Made from 16-gauge steel, each unit is individually boxed. Includes 3 rear brackets to prevent components from sliding backwards. This shelf helps to save valuable space by accepting the mounting of the PD-815SC-PBSH 8 outlet, 15 amp power strip on the rear of shelf (Requires 2 1/4" deep by 18 3/4" wide open space behind the shelf). Also allows the attachment of optional clamping bars to secure components.