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 rack-mounting 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. Also allows the attachment of optional clamping bars to secure components. The Breathe Easy™ vent pattern in the sides and bottom pan allow a generous amount of air to flow around your sensitive equipment. Three included L brackets keep equipment in place and prevent slippage over time.