Make your Pi a little slimmer with this microSD card adapter board. It slides in where the SD card goes but is half the length. Pop in a microSD card for a sleeker machine. Depending on the case from various manufacturers, the microSD card adapter may not easily slide in and out or may need modifications to the PCB or actual case. Most cases work fine though. However you might need to open the case to insert this adapter. So, it's not good if you always want to have quick access to your card.