A device for holding a workpiece, the device comprising, in one form, a base and a jaw member, wherein the jaw member includes a detachable jaw plate. The jaw member can further include a lock assembly which can attach or affix the jaw plate to the jaw member. In at least one embodiment, the lock assembly can include a cam, or lock, configured to pull the jaw plate toward the jaw member and/or secure the jaw plate against the jaw member. In certain embodiments, the lock assembly can include a slide which can be moved by an actuator such that the slide can engage the jaw plate and move the jaw plate into position. In at least one such embodiment, the slide can pull the jaw plate against the jaw member and, in addition, pull the jaw plate downwardly against a workpiece support surface.