Features: 1.Designed to Prevent Damage: This tool kit features seals that are sized smaller than the gland hole, which greatly reduces the potential for damage to the unit. 2.Wide Range of Sizes Covered: The hydraulic cylinder piston installation tool includes three sizes for installation of any rod seal from 0.87 inches for a wide range of uses. 3.Small: U cup installation tool fits 22 to 40mm (0.87 in to 1.57in ROD) cap holes with a maximum cross section of 6mm. 4.Medium: Piston rod seal U cup installation tool fits media gland holes with rod diameters of 40 to 70mm (1.57in to 2.75in ROD) with a maximum cross section of 8mm. 5.Large: The rod seal u cup install tool fits large gland holes with rod diameters of 70 to 165mm (2.75in to 6.49in ROD) with a maximum cross section of 10mm. Specification: Item Type: Hydraulic Cylinder Piston Rod Seal U Cup Installation Tool Kit Material: Iron Recommended oil seal installation fixtures and methods: the oil seal mating surface is flush with the shell datum surface to ensure the installation verticality after the shaft is installed, so that the oil seal lip is in line contact with the surface of the shaft to achieve a good sealing effect. Installation precautions: avoid deformation of the oil seal, make sure the shaft hole is clean, use proper fixture, keep the fixture in good condition to avoid tilting of the oil seal, install it in the right direction, make sure it is pressed into place, rubber oil seal and lubricating oil between the main lip and the dust lip, recommend to use the machine to install it, the oil seal is not allowed to be installed and used repeatedly