Check the listing for details. SPI 91-339-2 Machinist's Jack Set with 4 Jacks & Case: Adjustable 3" to 4" High. Condition: New. Listed at 38.20 USD. SPI 91-339-2 Machinist's Jack Set with 4 Jacks. Jack bases are cast iron; screws are alloy steel.Jacks are Adjustable from 3" minimum to 4" maximum heightFor use anywhere leveling is needed such as drill presses, milling machines, shapers, and other equipmentLifting capacity is approximately 1,000 lbsIncludes fitted caseSPI 91-339-2 Machinist's Jack Set with 4 Jacks: Jacks are Adjustable from 3" minimum to 4" maximum height. For use anywhere leveling is needed such as drill presses, milling machines, shapers, and other equipment. The lifting capacity is approximately 1,000 lbs. Includes fitted case.For over 60 years, SPI has introduced innovative products to the metalworking and laboratory industries. SPI measuring instruments are durable, precise, and reliable — all backed by an Industry leading 2-Year warranty.