Abstract: The workpiece holder includes a solid jaw and a flexible jaw made of hardened steel and supported by the machine table. The solid jaw and flexible jaw are movable relative to the table such that workpieces of various sizes can be positioned at a predetermined location relative to the machine tool. The solid jaw, once positioned, is unmovable. The flexible jaw can flex approximately 0.002-0.003 of in inch relative to the solid jaw such that the workpiece can be gripped or released by flexing or unflexing the flexible jaw. To provide the flexing movement, the flexible jaw is formed with a narrowed neck portion which can be deformed to create a flex point. A screw extending between the solid jaw and flexible jaw supports a nut which provides the force for flexing the flexible jaw. Because the amount of flex required to grip and release the work piece is very small, the screw and nut arranagmenet can grip and release a workpiece with only a quarter turn of the nut.