Foot Operated Double Post Adjustable Mayo Stand made of Stainless steel with 14"W x 19"L tray, adjusts from 39" to 62".These stands are number one in ease and convenience. Just lift the tray-frame - it automatically locks. To lower, hold the tray-frame and press the foot-operated control button. Release to lock in-place. A guard over the foot-button prevents accidental release.