Product Description Palmgren's line of versatile drill press vises set the industry standard. They are what you need for traditional drilling, tapping, reaming, spot-facing, counter boring, as well as countersinking operations. Palmgren's line ranges from 1-1/2 inches to 6 inches. This original design is used in industries everywhere. The Palmgren Drill Press Vise adjustable jack screws are a handy tool for leveling work on machine tables or fixtures, setting up machinery, and general use in the tool-room and machine shop. Available in 4 adjustable sizes, each jack is designed with a quick acting height adjustment, fine adjusting screw, height locking ring. This 4 inch drill press vise is made from 30,000 PSI tensile strength, fine grain cast iron and comes complete with replaceable steel jaws. The base and bed are parallel to 0.001 inch, and the center of the base is open to allow for holding work through the body of the vise. All Palmgren Drill Press vises can be mounted on the base, either side or placed on end for general use. Palmgren Drill Press vises also come with a Lifetime Guarantee, so you can focus on the job at hand and trust in your tools. One longitudinal T-slot with three transverse 3/8 inch T-slots.Base size 6-3/8 inch x 7-5/8 inch.Height 3-1/2 inch.Four 5/8 inch slots for mount to work surface. From the Manufacturer One longitudinal T-slot with three transverse 3/8 inch T-slots.Base size 6-3/8 inch x 7-5/8 inch.Height 3-1/2 inch.Four 5/8 inch slots for mount to work surface.