20 / 50 Tons Hydraulic Cylinder Jack, 4in / 6in(100mm/150mm) Stroke Single Acting Lifting Ram. This is a new 20Ton / 50Ton Hydraulic Cylinder Jack. Lightweight design for small workspace. Chromium plated surface of piston, prolonging the service life of piston. Plunger has the function to retracting automatically. In order to operate correctly, all oil cylinders need to be connected with solid and flat surfaces. For example, using thin oil cylinders in sandy soil or loose surfaces will cause damage to the oil cylinders. Due to the different display and different light, the picture may not reflect the actual color of the item. Thanks for your understanding. The joint of this product is a ZG-3/8 19 tooth British taper thread. Feedback is very important to us. It is impossible to address issues if we do not know about them! Faction is our ultimate goal. We work hard to earn your trust and future business. A If you receive a defective item, you may return it or ask for a discount. Due to time zones, our reply to your questions may not be immediately. If it’s non-workdays, please kindly be patient and wait till Monday.