Tower lift truss support lift tower truss display light lifting system Manual telescopic mast with hand crank operation, no electricity required, suitable for outdoor construction, emergency lighting and off-site working scenarios. Reliable self-locking function allows locking at any height, stable and safe, preventing accidental drop or reverse rotation. High-strength rust-proof metal structure, strong load capacity, stable and anti-sway, ideal for long-term outdoor use. Labor-saving hand crank drive for easy lifting and lowering, simple operation, one person can complete height adjustment., Manufacturer: manyuny