IMPROVEMENT - Front-Removable, the mounting bracket allows each Raspberry Pi can be individually removed from the front without removing the whole thing.; Wide Compatibility- The rackmount can house up to 4 RPis, and the RPi mounting bracket supports Raspberry Pi 4 B and 3 B/B+ and all other B models.; IMPROVEMENT - Thumbscrew, quality metal material, and the grip knob thumb screw adopt a screw-in design, which helps you install and replace quickly and easily, no tools needed!;
Standard 1U Size: 19"× 1.75" ( 482.6 × 44.5 mm), fully compatible with 19 server racks, had no issue plugging this into the 1U rack space.; Options - SD card
Extension Cable ASIN: B09CKRDFTH is available to make a different configuration for your different Pi racks.