Large tripod base stand insures operator stability Pin positions provide five height range adjustments: 57 - 7/8", 63-25/64" 68-57/64", 74-13/32", 79-59/64" Adjustable saddle screw column raises / lowers one inch every 5th teeth for additional height Large saddle with rubber pad to insure positive contact and add stability Heavy duty all steel frame construction with rust resistant finish for longer tool life Ball bearing post support and screw column provides smooth positioning of exact height adjustment Manufactured to strict ANSI portable automotive lifting device specifications and testing standards