MODEL SHAPE HEIGHT DESK L457 A 17.5'' 17''x24''x27.5'' L407 - NBRK A 17.5'' 17''x24''x27.5''OPTIONSPerma-Tuff EdgePlywood Core Work SurfaceSolid Plastic Work SurfaceSeat and Back PadsBlack EdgeNon-Skid GlidesQ-Ball GlidesSteel Glides