Training table with no grommets adjusts in 1" increments to the height you need, ranging from 22-1/2" to 32-1/2". The rectangular top features laminate over 1-1/8" thick, solid-core, high-density particleboard. Underside is sealed to resist warping.Legs are locked in place with screws using included hex wrench. Plastic leveling glides provide 1/2" adjustability with a base diameter of 1". Workstation meets American Disabilities Act requirements for wheelchair accessibility and meets or exceedsANSI/BIFMA and ISTA performance standards.