Worm screw jack: 1.Small size &easy installation; 2 Flexible using, extensive; 3.Low noise,durable of using 1.Model: RN-0.5ton, RN-1 ton, RN-2 ton, RN-3 ton,RN-5 ton,RN-10 ton, RN-15 ton, RN-20 ton, RN-30 ton, RN-40 ton, RN-50 ton, RN-100 ton;2.Configuration: Worm Gear, Worm Shaft, Taper Roll Bearings, Seals, Housing, Self-locking Trapezoidal Screw,etc;3. Safely self locking, Positioning ...