... with travelling nut 2. Size = 2.5, 5, 10, 15, 20, 25,35 (×10KN) 3. M = Low worm gear ratio with ... .821.671.672.154.155.20LubricationZGN-1 or ZGN-2 (-20-+100)Grease quantity0.10.30.50.50.751.11.9 ... prevent the load from being lowered.All copyright reserved swl series worm screw elevator, screw jack, lift