Our best selling combination desk. Rock-solid frame with millions of units sold. MODEL SHAPE HEIGHT DESK H458 A+ 18.5'' 18'' x 24'' H457 A 17.5'' 18'' x 24'' H455 B 15.5'' 18'' x 24'' H453 C 13.5'' 18'' x 24'' H408 - NBRK A+ 18.5'' 18'' x 24'' H407 - NBRK A 17.5'' 18'' x 24'' H405 - NBRK B 15.5'' 18'' x 24'' H403 - NBRK C 13.5'' 18'' x 24''OPTIONSLaminate Work SurfacePermaTuff EdgeBlack EdgePlywood Core Work SurfaceNon-Skid GlidesQ-Ball GlidesSteel Glides