Features: It has a soft shock absorbing effect because the self-pressure-regulation function. It can reduce shock and noise in automated mechanical operations, enhance working efficiency. Shell is made of high quality material, good damping, high hardness and strong heat resistance. Greatly reduce the shock and improve the stability. The spring inside can reset the piston rod fast cause the perfect movement of the check valve. Specifications: Material: Alloy + Stainless steel Color: Black Stroke: 20mm Max absorbed energy: 22Nm Energy absorb: 35000Nm/h Effective weight: 10-160WE(KG) Allowable speed: 0.8-3m/s Working temperature: -10~80 Thread: M14 Length: Approx. 12.6cm / 4.96inch Weight: Approx. 106g Package Included: 1 x Oil Pressure Shock Absorber Note: Please aim the impactor at the center of the shaft. Do not remove the front cap to use, because remove the cap will lengthen the piston rod and make it hit to the bottom, this may break the bottom. It is strictly prohibited to spray paint on the tube teeth and shaft hub, otherwise it will affect the heat dissipation effect and leak oil. Do not make the piston rod rust and other foreign matter. If there are two or more vibration absorbers are installed on the same side, Please confirm the synchronization. For safety, do not break it up to use. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering. Package List 1It has a soft shock absorbing effect because the self-pressure-regulation function. 2It can reduce shock and noise in automated mechanical operations, enhance working efficiency. 3Shell is made of high quality material, good damping, high hardness and strong heat resistance. 4Greatly reduce the shock and improve the stability. 5The spring inside can reset the piston rod fast cause the perfect movement of the check valve.