Soff Jaws hold parts tight, but undamaged. Jaws are 3-1/2" wide, and work on vises 3-1/2" to 4" in width. Magnetic back keeps them in place, makes them easy to take on and off. Choose Leather Lined jaws (shown) for items where a firmer grip is required. Choose Foam Lined jaws (#47423) for a more delicate or oddly shaped objects. USA