Features 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. .