Mechanical jack 20000kg 20ton(1) jack block (2) hexangular bolt (3) rack (4. axle (5. hexagular nut ( 6. left breaket(7. washer(8 pawl spring etc
Put the mechanical jack on eveb place the goods on the lower support stand or the upper support stand, shake the level, clockwise to lift the goods, vice verse, the goods are lowered down