There is currently no available "Beginner" label. The following is the default level label: Since this clamp is made entirely of wood, including the threaded screws, a woodworker or his apprentice could make such a clamp during slack periods. As mechanization evolved, such clamps and other tools were often bought from specialized toolmakers. Cabinet and furniture makers use similar clamps to this day, though many clamps are metal now. The wooden screws are turned to tighten the jaws' grip ensuring a tight fit and constant pressure while the piece is worked on or while waiting for the glue to set.