Product Feature: * Universal Compatibility: Hydraulic Seal Installer and pick and hook set are quick and safe installation tools for flexible rod seals. 3 sizes to cover most rod seal installation job from 0.87" up (Rod Diameters): (S) 22-40mm (0.87"-1.57" Rod) gland hole ; (M) 40-70mm (1.57-2.75" Rod) gland hole; (L) 70-165mm (2.75"-6.49" Rod) gland hole. * Efficient Work: Fast and simple to install, impossible to mess up. Simply put the seal in it in seconds, smoothly rotate the arm of Hydraulic tool to bend the seal to a Kidney Bean shape and insert the seal to the cylinder groove. Efficiently save you time and effort to complete seal installation work. .