Our Premium Toolmakers INSERT vise precision = .0002 Home Gunsmith INSERT Vise. Jaw Width = 2-1/2 Jaw Open = 3-3/8 Jaw Depth = 1-1/4 Vise Length = 7-1/4 What the Heck is an INSERT vise anyways? A special vise that is intended to be held inside the jaws of another vise. Complex setups that would take hours to perform using traditional "indicator based" setups are done in literally seconds....no fooling. All sides are precision ground to within .0002 so anything you clamp into this can be held in your mill vise with confidence. Here are a few examples of how the Gunsmith INSERT vise can be used. Of course it is also a precision stand-alone vise in it's own right.......a must have item.   Check out our Video "Modular AR-15 Style Rifle for all the instructions and tips on how to use this VERY handy vise.