Balt Lab Stool Without Back, Gray, 1 Carton Solid wood seat (12 1/4-Inch x 1-Inch) is height adjustable from 18 1/2-Inch to 29-Inch in 1 1/2-Inch increments. Leveling glides are included. Metal nut inserts in the seat prevent loosening and wood splitting. Frame is gray powder-coated steel with a footrest. 10 year guarantee. GREENGUARD Indoor Air Quality Certified and GREENGUARD Children & Schools CertifiedSM.