Base with casters is designed for 60" wide and 72" wide Safco Impromptu Mobile Training Tabletops. Convenient Impromptu tables let you configure your conference room, training area, meeting spaces and other gathering areas easily and with style. Optional ganging connector (sold separately) secures tables together when needed and quickly detaches for easy reconfiguration. Table base includes 1-1/4" tubular steel frame with polycarbonate modesty panels and four 2-1/2" casters (two locking) for mobility. Base meets or exceeds ANSI/BIFMA standards.