Protection: Four adjustable glides prevent floor scratches and keep lectern stable.Sturdily Built: Constructed from 16-gauge 1 x 2 square tubular steel.Convenient Design: Book stop prevents papers, books and other materials from sliding off the surface.Finished Edges: 5/8 PVC smooth black T-Molding provides attractive contrast to all surface colors and matches the base.Adjustable: Plastic knob