Aluminum alloy inner and outer tubes, combined with twin alignment bushings, ensure a precision alignment. The anodized finish keep the tubes virtually corrosion free. Adjustable mount and swivel system-can be adjusted to any desired height. Pull pin with ergonomic grip makes it easy to swivel into position for lifting or transport. Twin track 7" diameter wheels are designed to roll independently to make changing direction smooth and effortless. 51/2" wide wheel base adds superior stability. 1,600 lbs capacity. Wide Track with Footpad.