Used with the new style DX6 Kurt 6 inch Vise Slips in bottom holes machinined in the DX6 Vise 1 package consists of 2 keys and 2 o-rings Fits Tables that have a 5/8 (0.625") slot width Fits many Machines like- HAAS, OKUMA, MAZAK, HURCO, FADAL, BRIDGEPORT Manufactured from AMERICAN 4140 Steel vise keys are used to align your vise to your milling machine table.