I was so impressed I bought two sets: an oscilloscope probe set and a spares set. Holders securely hold circuit boards up to 8 mm thick. The magnets at the base of the holders are very strong and don't move. There is a sheet of plastic that can be placed on the base to act as an insulator if needed. The flexible neck that holds the probe is amazing. It's flexible and leaves the probe *exactly* where you placed it. Needle tips make it easy to inspect the pins of even the smallest surface mount chip or other component. When you need to inspect a circuit board - even at a single point - this kit allows you to inspect contacts safely and hands-free without accidentally moving the board. Feeler gauge and shot pins or wires.