19 INCH 1U RACKMOUNT FOR 4x RASPBERRY PI. This rack mount comes with 4 empty slots for 4x Raspberry Pi. Fits below models: RASPBERRY PI 4 MODEL B, RASPBERRY PI 3 MODEL B+, RASPBERRY PI 3 MODEL B, RASPBERRY PI 2 MODEL B, RASPBERRY PI 1 MODEL B+. Per Raspberry Pi there are also 2 spaces for 2 connectors. For these 2 inserts for connectors, you can optionally choose LAN (item no. 8719992970087), USB3 (item no. 8719992970148), USB-C (8719992970162), Audio (8719992970131) or HDMI (item no. 8719992970124). Blank inserts are available also (search for 8719992970247)