“I used the Nano HAT Hacker as a GPIO PASSTHROUGH as the Pi's GPIOs were taken by an attached display. I wanted to extend the GPIO and keep the profile low to fit in a shallow case. It measures 65mm x 19mm x 1.5mm. It's the perfect GPIO Passthrough, although I'd have liked the holes to be very slightly smaller to just scrape through the Pi GPIO pins thus avoiding any soldering. I had to apply a tiny amount of solder at each pin joint to ensure full contact. I would highly recommend this to anyone who needs to extend the Pi GPIO where the header is fully occupied by another peripheral device, in my case a display.”