Features: 1) International standard design in conformity with CE standards 2) Chain lifting system 3) Anti-breakage safety for chain 4) Self-locking protective device, with double safety 5) Anti-abrasion nylon slide block 6) Automatic arm locking during lifting and automatic unlocking when the arm reaches the floor 7) Without metal base, posts anchored onto the floor 8) With narrow plate to cover the chains on the floor 9) Folded steel posts with high rigidity 10) Manual lowering 11) Asymmetrical arms, symmetrical posts 12) Double hydraulic cylinders to ensure stable moving