Features: Using a hydraulic tool helps reduce the chance of installation damage. Rapid and safe installing tools for flexible rod seals. Includes 3 sizes to cover just about any rod seal installation job from 0.87" up. Made of high quality stainless steel, which is of good quality and durable. It is very easy to use, only two steps are needed. And with the hydraulic cylinder sealing tool, you can quickly complete the installation of the seal and it doesn't take a lot of effort. Package Includes: 3x Hydraulic Cylinder Piston Specifications: Material: stainless steel note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item.