– Smart mast roller, adjusting eccentric bearing ensure mast verticality, keep mast verticality from 89.3-89.7 degree.
– Smart supporting leg, the steel tube is inside of leg Square steel, ensure the strength of supporting leg.
– Smart design to reduce the noise when unloading running by a special screw with a spring tip
– Stronger backrest, full welding from front to back of backrest, ensures the strength.