Nylon Vice Jaws Magnet Assemble Hose Fittings Tool AN Jaw Fiber Vise Hold th hex of the AN fittings during assembly Can use with any size fitting from -3 AN to -32 AN You will not get any scratch on your aluminum part totally Unlike with old aluminum vise jaw that will still make a mark on the hose end fittings MaterialNylon wioth Fiber +strong magnet