Over the years, many cars have adopted the bolt-on design for windshield wipers. Even though they are not large, the wipers can be almost impossible to remove because the wiper arms are made of one type of metal and the post is made of another type of metal. This causes a type of corrosion called galvinic corrosion and it is almost like they fused together. With our wiper arm removal tool, you can place the prongs under the arm (use care not to hook the wiper post) then place the pressure bolt over the head of the windshield wiper bolt and screw the pressure bolt down. Rock the arm up and down and the arm will come off of the bolt. The small compact design fits easily in small spaces. Made of steel with a plastic handle.