Feature●This 19 inch rack mount kit is specially designed for recording Raspberry Pi 4B boards and supports up to 4 units.●Standard size 1U 19" x 1.75" (482 x 44 mm), fully compatible with 19" server racks, could be easily plugged into the 1U rack space.●Raspberry Pi Fan; Micro HDMI to HDMI board provides easy access to HDMI port; TF card to FPC board provides easy access to TF card slot●EASY TO INSTALL: 4 slots for Raspberry Pi 4B, fixed with included screw; the rack can be fixed vertically on the mounting rail (the rack mounting screw is included).●Technology support: https://wiki.52pi.com/index.php/1U_19%27%27_Rack_Mount_for_Raspberry_Pi_4BDescription