/ Precision Measuring Tools / Precision Hand Tools / Precision Shop Tools / Jack Screws / 191A * Not actual product image 50688 191A Little Giant Jack Screw - Jack Only 50688 Other similar products 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. Jack Only. Features Specifications Parts Contact Starrett Features 20-pitch screw Range : 1-1/2 - 2-1/4" / 38-57mm Jack Base Diameter : 1" / 25mm Specifications Range (in): 1 - 1/2 to 2 - 1/4" Range (mm): 38 - 57mm Maximum Height - Attachments (in): 3 - 3/4" Maximum Height - Attachments (mm): 95mm Parts Member of Kit Item #DescriptionPart No.QtyInformation 10JACKSCREW W/CAPPT990311 20•JACKSCREW .375-20RD02148-01 30•PLATE,TOP02150-01 40ROD, 1 1/2-3 1/2"02151-01 50BASE, 1- 1/2 - 3- 1/2"02145-01