JIMS has developed a new tool for installation ease of exhaust gasket seal on all Twin Cam or Evo heads Will safely install exhaust gasket seal evenly and square without distorting the seal Without a proper tool, installing could run the risk of developing an exhaust leak Uses either the two exhaust stud flange nuts fro the exhaust system or JIMS tool handle to install the seals Manufactured from high grade 6061 aluminum, and then finished with JIMS blue anodizing