Platform Jack is a highly stable laboratory jack that can be adjusted to any height between ” (64 mm to 254 mm) The jack will accept loads up to 100 lbs. (45.4 kg). The unit is constructed of aluminium top and bottom plates with a brushed aluminium finish and plated steel cross members. Height adjustments are achieved by means of a threaded rod attached to a large serrated knob. (Laboratory jacks are designed to support and adjust height, not for lifting loads.).