Hydraulic Seal Installation Tools Compatibility:Small and can be used for 22-40mm diameter (0.87"-1.57" rod) gland holes. Medium for rod diameter 40-70MM (1.57" - 2.75" ROD) gland holes. Fits rod cover holes 70-165MM in diameter (2.75" - 6.49" ROD). Widely Used:Hydraulic cylinder gland seal tool is suitable for installing automotive marine hydraulic cylinders, bucket cylinder inner seals, O-rings, auto cars ship inner flexible rod seals, skid steers, loaders, backhoes, etc Twist the seal into a W shape so that it fits the groove. It makes hydraulic piston seals easier and can be installed quickly in seconds, saving you a lot of time. Non-Slip Design: Hydraulic repair tool kit uses a plastic handle to prevent slippage during use.All edges of the product are polished and smooth. If you work on hydraulic cylinders, this is a "must-have" tool for internal seals We focus on the customer's experience of using the product, if you have any dissatisfaction with the product, please feel free to contact us.