Double Cutlery Trays are available for boxes as small as 4” high, fitting in a typical top drawer configuration. The 4” box uses two 1 1/2” high trays. Other Double Cutlery Tray boxes incorporate two 2 1/4” high trays in a 5 1/2” or 6” high box. All Double Cutlery Tray assemblies use full-extension slides. Variation: order the bottom layer with a knife block insert.