This is a great little tool for solder rework. It allows you to pull the molten solder out of a connection or via. To use it you simply depress the plunger, heat up your solder, place the nozzle over the solder you want to remove and finally just push the button. The piston pops up and the solder disappears! This solder vacuum has a metal body with a plastic handle and a hard plastic nozzle.