The cover rigid and versatile machinist's jack screws set is a comprehensive tool collection designed to provide stability and support in machining operations. Crafted with precision and durability in mind, these jack screws offer versatility and reliability for a wide range of applications in machining workshops, manufacturing facilities, or hobbyist garages Set Includes 1 x Main Jack, 2 x Extension pieces of 1" & 2" length, 2 x optional bases (for spherical & channel /slot support, 1 x spare auxiliary single point extension and 1 x locking bar. Range of the jack support starts from minimum 2-1/4" to maximum 6-1/2" / 57 - 165 mm ( Using both the Extension support pieces of 1" and 2"). Jack Base Diameter : 1-1/4". Square threads for positive locking under heavy load. This jack set works best as a supporting tool to a work piece (like in case of no support when clamped half length through a vice's jaws) at a mill to avoid any bending for better accuracy milling results Can also help fixing an angle of a sin bar (if you do not have the block gauge), can act like a spacer to avoid any cramp in the jaws of the vice when a work piece is held through its corners jaws space, to keep the vice jaws parallel. Made out of hardened tool steel , this Machinist jack screw set of 8 pcs has very versatile uses in the tool room for setting up your work-piece right under heavy cutting or work load. Very useful to be used along with a digital angle gauge to use for clamping/ setting up a work piece at an angle at a milling machine. A jack screw can also be looked as a substitute of a tailstock to support the rear end of a work piece,while not really doing an Indexing job on a Rotary table

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