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 29-1/2" high workstations. Fixed front casters and swivel back casters for easy mobility. "One Key" core removable lock makes re-keying quick and easy.