Used with Kurt 6 inch Vise- May fit others with a 11/16 (0.688") Vise slot width 11/16X 5/8 inch 1 package consists of 2 keys and 2 screws 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.