This simple, versatile carryall offers three spacious flat shelves. Rolls smoothly on standard 4″ soft-tread dual-wheel casters. Or choose optional 5″ dual wheel or 5″ single-wheel casters. Model #21051 measures 18″d x 36″w and includes three (3) flat shelves. Available in 11 powdercoat paint finish options.   Smith System® booktrucks are the perfect school cartsfor storage in any school setting. They can carry up to 400 lbs of books, paper and projects and with dual wheel casters, they move easily through aisles on soft-tread. As an option, you can attach a booktruck Riser Shelf with a laminate top with your choice of edge banding. The shelf stands 6” above the booktruck handles. Optional Booktruck Top Shelf work surface in 1 1/4″ thickness, with Platinum pole supports. Compatible with all 36″ wide Smith System® booktrucks. Choose from 15 laminate colors and 15 edge colors, pole in Platinum only. The sturdy poles clamp onto the Booktruck handles on either side to achieve a secure attachment.