●Do not worry about scraping the crank surface. ●Universal use covering a wide range of cars with oil seals between 27 mm and 58 mm in diameter. ●Use the existing bolt in the vehicle for installation. ●Screw-type adapter to fit the centering. ●The blue seal adapters are made of aluminum to prevent the damage of crank. ●Note: Do not attempt to use this tool by force. ●Some cam seals have screws to prevent remove.