Allow the crank seal to be replaced without dismantling the crank case saving time and costs. No worry to scrap the crank surface. Universal use covering a wide range of cars with oil seals between 27 mm and 58 mm in diameter. The blue seal adapters are made of aluminum to prevent the damage to crank. Please also check our ebay store:http://stores.ebay.com/topautotoolsClick here to visit our ebay store! We Accept PayPal .