Arma Polytech Vise Jaw Pads work with any bench vise, milling cutter fixture or drilling machine to help protect all your firearms parts and accessories. Embedded magnets secures the vise jaws (or blades) in place. Helps prevent scratches or damage to finer surfaces. Multi-groove design allow them to grip and fix wood, plastic, metal, threaded objects or any round, irregular or flat things. Arma Polytech Two Piece Vice Jaws are made of high quality TPU material that is soft enough to protect the surface from damage, but sufficient to hold the item in place.