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Hinged Wallmount Rack 5.25in x 19.5in x 9.9in, 3U (Adjustable Internal Depth 9.9~13.5in) - GSA Approved - Monoprice.com
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UCTRONICS 19 inch 3U Rack Mount for Raspberry Pi 4, with 8 Mounting Plates, Extendable to Support 12 Units of All Raspberry Pi B/B+ Models
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