"Fork seal installation tool is designed to be used with the fork tube inserted into the lower leg. The seal is then slid over the tube on top of the lower leg seal bore. Wrap the tool around the fork tube and use it like a slide hammer. This 25 ounce 2-piece carbon steel tool will drive the seal in squarely with the bore without fear of damaging the seal lip. Fits most 41mm (15/8"" ) conventional or inverted forks."