Model YOS-550 without desk top The features: A. It is very smooth and quiet B. The column can be set up at center position C. Movements: Elevation Range: 685~885mm Maximum Load: 50KG Net Weight: 23KG Voltage: AC 115V 60Hz, AC230V 50Hz D. CE Certificated E. YOS-550 is used by UL/CSA/CE safety approved element NOTE: Offer custom desk top size. The desk top is not included to offer with YOS Series. Must be to extra order