See the difference quality makes in your classroom! National School Lines designs, manufactures and assembles their furnishings to withstand heavy use for a full generation. All seats, backs and desktops are constructed of molded melamine plastic with Corex Tru-Fit™ metal inserts for outstanding strength; frames are 1"diameter tubular steel with chrome-plated finishes and self-adjusting nylon floor glides. To prove their word is as solid as their products, NSL offers a lifetime warranty on all frames. Why settle for less? Table Desks Height-adjustable desks are perfect for multi-user environments. Choose from three styles. The standard-top desk includes a chrome wire book rack, or choose a model with open-front or lift-lid access to a 4 1/2"H x 22 1/2"W x 15 3/4"D book box with built-in pencil tray. All desks measure 22–29"H x 24"W x 18"D overall.