... , Self-locking Trapezoidal Screw,etc.* Model: RN-0.5ton, RN-1 ton, RN-2 ton, RN-3 ton, RN-5 ton ... each model. Fast ratio,1 turn shaft,1 mm stroke; Medium ratio,1 turn shaft,0.5 mm stroke;Low ratio,1 turn shaft,0.25 ... mm stroke. * Electric Motor Horsepower Range ...