This is to take the top off of the can so you can collect the tops for a fundraiser.https://youtu.be/io9A7pokDP4The cutting wheel is from a pipe cutter. You can buy a two pack at the hardware store for about $5.50. The screw is 3/4" long same diameter as the hole in the wheel. Screw the screw through the wheel into the canpeeler. To use just clip onto the rim of any aluminum soda or beer can and press down so the wheel cuts into the side of the can. Then just spin the can all the way around and the top comes off.