Steel ball bearing suspension; full extension on file drawer, 90% extension on box drawers. High-sided file drawer allows front-to-back letter-size filing and includes follower block and crossrail. Counterweight inhibits tipping when opening more than one drawer. Fits under 29.5" high workstations. Fixed front casters and swivel back casters for easy mobility. "One Key" core removable lock makes re-keying quick and easy.