... stable and reliable4.Chain-equalization system5.Single manual or e-lock release system,safe and reliable6.Wear-resistant, heat-resistant ... beautiful and concise 4.Chain-equalization system5.Single manual or e-lock release system,safe and reliable6.Wear-resistant, heat-resistant ... driven system, faster lifting and lowering speed.5.Single e-lock release system, safe and reliable6.Wear-resistant, heat- ...