Nothing on the market compares to the simplicity and functional ease of the EF-BT-21. Superior independent controls for height with finger-touch paddle. The readily accessible pull latch for tilt adjustment also incorporates a tilt indicator for quick visual, measured reference. Durable, stable and smooth Ball Bearing glide adjusts depth of tray on 21” track. Adjustment Ranges: 7.5” neck. 360° swivel. 10° positive tilt to 15° negative tilt.