This tool is the best. I use it on my bikes, but it can be used on A/C and other equipment with Schrader valves. The best thing is that people with big hands and fat fingers can use it. The second best feature is the B-side with the hole. One side is a wrench to pull the valve out, but the side with the hole screws onto the valve and a pin holds the valve open to let the air out. So you can screw it in and come back later or just let off a little pressure without having to remove the valve itself.