Most Commonly used Size:-04, -06, -08, -10, -12, and -16,It can meet most of your needs. Application Our PIKWO hydraulic jic plug and cap kit are made from 45# structural steel widely used in agriculture, contruction,mining and fuel industries for high pressure fuel delivery and fluid power applications,seal hoses, tubes, and pipes. Equipped with high-quality plastic outer box, with accessories parameter table. Build to last:80 pcs caps and plugs kit made from super strong material and special process treatment have greatly extended the service life of our products, with excellent sealing ability and corrosion resistance.