Little Giant Jack Screws are used for leveling work on planer beds, drills, setting up machinery, and general use in toolrooms or machine shops. 191 Series are 1-1/2" to 2-1/4" / 38-57mm 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. 1" Extension Base Only.
This item has been discontinued.
Little Giant Jack Screws and accessories are no longer available in North America. Please contact your Starrett distributor for an alternate brand.
For additional support, please contact our customer service department at (978) 249-3551.
[Discontinued 03/2026]