This plate is custom-designed by nullbits to fit the TIDBIT 19-key numpad kit. It adds additional support and strength to your TIDBIT build. It supports most TIDBIT layouts: all switch configurations, rotary encoder positions, and OLED display. However, it is not compatible with the top-row 1.2 inches 16x8 LED Matrix. It's perfectly sized for a Bit-C MCU and other Pro Micro MCUs. Build your TIDBIT with 3-pin plate-mount switches or hot-swap sockets without worrying about stability or alignment. NOTE: This listing is only for the FR4 plate. TIDBIT kit sold separately.