KKSB 19-Inch 1U Rack Panel for Raspberry Pi Rack panel for up to five Raspberry Pi boards The KKSB 19-inch 1U Rack Panel for Raspberry Pi is a rack panel for mounting up to five Raspberry Pi boards in 19-inch rack systems. The steel construction with black textured powder coating provides a stable platform for structured installations. The front panel allows direct access to USB and Ethernet ports.