Pimoroni PIM511 HAT Hacker HAT is an interface development tool that comes with two mini HATs. This tool is designed to connect multiple mini HATs to one Pi. The tool includes two sets of GPIO pins used for attaching two mini HATs (or a HAT and a mini HAT) at the same time. This helps great for prototyping, debugging, or for connecting a mini HAT to other circuitry. The HAT Hacker HAT tool also features 2 landing areas for mini HATs with pre-installed 40-pin male connectors and a pre-installed 40-pin female connector.