The lab stool is an attractive, durable, and practical seating choice, ideal for science classrooms and other learning environments. Solid wood seat (12.5"Diameter x 1"d) is height adjustable from 18.25" to 29.25" in 1.5" increments. Frame is black or gray powder-coated steel with a built-in footrest. Metal nut inserts in the seat keeps screws in tightly and prevents the wood from splitting. Leveling glides are included. Optional back made from 8-ply veneer (6.25"H x 12"w). stores under the seat when not in use.