The UPR35-6B is a black Universal Master Rack Panel with six openings. The steel frame makes it easy to swap out individual sub-panels. L-com's universal master rack panel system offers installers the ability to customize their installation with different connections within a single rack panel. The USP universal series sub-panels can save time, money and rack space. The master rack panel features six punched rectangular openings that will accept any of the numerous USP sub-panels that L-com offers.