... Type 1 = Screw jack with translating screw Type 2 = Screw jack with travelling nut 2. Size = 2.5, 5, 10, 15, 20, ... 4. Direction of lifting screw A = Upright B = Inverted 5. Lifting screw end execution I = Column end II = Top ... bellows, specify in order8. Options F = Locked against rotationExampleSWL 2.5 - M - 1 - A - II - 250 - FType Size ... reserved swl series worm screw elevator, screw jack, lift