Universal Device Placement Rack, Works with 1/2 Rack and Nonrack Devices, Punch Out Shelf Allows for Ventilation, Heavy-Duty Steel Construction Place your nonrackable equipment in standard 19 racks with the Pyle Pro Server Rack Mounting Tray a set of two (1 RU and 2 RU) steel ...Universal Device Placement Rack, Works with 1/2 Rack and Nonrack Devices, Punch Out Shelf Allows for Ventilation, Heavy-Duty Steel Construction Place your nonrackable equipment in standard 19 racks with the Pyle Pro Server Rack Mounting Tray a set of two (1 RU and 2 RU) steel universal device equipment rack shelves well suited for use in the studio or onstage. With a punch-out bottom shelf that provides plenty of ventilation the rack shelf promotes safety and air circulation. Each rack shelf can accommodate 1/2 rack and nonrack/tabletop devices and is compatible with all 19 server racks.