1,Professional R&D Management 2, CE&ISO approved .3,High Safety and Precision . 4 ,Imported (FEC80 ) Chain 5 ,Lower noise . ELK Model DZ Hanging CranePillar Style Cantilever Hanging Crane. The pillar style cantileverHanging Crane can rotate aroundThe pillar. Only simple construction,it can be used open-on-air or indoor.