This jack is for use in a chemistry lab for example. A support rod is attached via this threaded hole onto which other items are attached like a holder for a flask, distillation condenser, etc., various support items.
The Sta 8 X 8 Inch 88LB Aluminum Oxide Lifting Platform Heavy Duty can bear a weight of 88lbs, but it is not recommended to store heavy objects for a long time.
The rod appears to be a 1/4-20 or perhaps a metric equivalent about 8 inches from tip to handle and has a non threaded area in the center to act as a stop.
