Little Giant Jack Screws are used for leveling work on planer beds, drills, setting up machinery, and general use in toolrooms or machine shops. 190 Series are 2-1/4" to 3-3/8" / 57-85mm in Size. Series 190 and 191 have 20-pitch screws and for those who desire a finer adjustment, the F190 has a 40-pitch screw. 2" Extension Base Only.
This item has been discontinued.
Little Giant Jack Screw program discontinued. Starrett resources have shifted to Precision Measuring Tools.
For additional support, please contact our customer service department at (978) 249-3551.
[Discontinued 05/2026]