The unique design of recent iMac models requires the cutting of the foam tape on the display to get inside.
This tool comes in two parts:
The handle is made of reinforced nylon and easily accommodates the cutting wheel while providing plenty of grip. In addition, the back of the handle features a thin prying and slicing blade to ensure you loosen all the adhesive.
The cutting wheel is specifically designed to slip in the hair-thin gap between the display and the aluminum frame, then easily cut the foam holding the two pieces together.