Support Shelf provides 8.0" x 20.0" (20 x 51 cm) work surface to support remote equipment such as an aspirator pump within easy access of the biosafety cabinet. Powder-coated steel shelf mounts to left-side tubular frame of the base stand. Includes powder-coated steel shelf and fasteners. Not for use with SoLo Hydraulic Lift Base Stand. Installation is required.