Starrett SF190 Little Giant Jack Screws Complete Set With Fine-Adjusting Screw And All Attachment

The Starrett SF190 Little Giant jack screws set is a six-piece jack screw set that can be used to level a workpiece on the table of a planer or drill press or in a machine shop. The 20-pitch jack screw measures 1-1/4" in diameter at the base and offers a height range of 2-1/4 to 3-3/8 inches. The 1" and 2" extension bases can be used in combination with the jack screw to achieve a maximum height of 6-3/8". An auxiliary pointed screw can be used in place of the screw with a swivel cap. An additional extension base is suitable for use on irregular surfaces. An extension "V" base can be used against a cylindrical form. Jacks are machines used to lift heavy objects, such as vehicles, trailers, structures or heavy machinery. Jacks come in a range of styles for different applications. Common varieties include bottle jacks, which resemble a large bottle in shape and use hydraulic force to lift the load; floor jacks, which typically contain a long pump handle and caster wheels and sit low to the floor; and tongue jacks, which can be mounted onto the frame of a trailer to lift and lower it. Jacks can be used on construction sites or in warehouses, automobile repair shops or industrial facilities. The L.S. Starrett Company manufactures precision measuring tools, metrology and testing equipment and saw blade products. The company, founded in 1880, is headquartered in Athol, MA. What's in the Box?20-pitch jack screw1" extension base2" extension base Auxiliary pointed screw Extension base for non-flat surface Extension "V" base for cylindrical forms