1U Hinged D-Series 12 Connectors Punch-out Component Blank Panel is designed to accept Audio D Series connectors for 19" Rack mount, such as XLR, HDMI. Fits Standard 19 Inch Server Rack or Cabinet Hinged on Both Ends Helps with Adding Cables Later to a Wall Rack with Limited Access Take 1U Space, 19 Inch Width 4 Pins around Each Punch-Out and Accepts Different Type of XLR Connectors or others. Making Installation Easily.