Starrett  PT99031 Jackscrew W/Cap for 191 Series 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. last  pic is for reference only...tool sold separately EMAIL US WITH YOUR QUESTIONS

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