Fitment: Universal Description: -Making smaller size than gland hole by turning seal to omega shape can avoid damages. fits for auto cars ship inner flexible rod -seals, such as hydraulic cylinder piston seal up u-cup, O-rings. -Made of high quality stainless steel, anti-deformation and anti-corrosion, durable for long time use. -Size of Small For rod diameters 22-40mm(0.87" - 1.57" ROD) gland hole, 6mm cross section max -Size of Medium For rod diameters 40-70MM (1.57" - 2.75" ROD) gland hole, 8mm cross section max -Size of Large For rod diameters 70-165MM (2.75" - 6.49" ROD) gland hole, 10mm cross section max .