The flush mount quick change system base plate is for the reloader who's bench serves many purposes. Enjoy a clear, flat work space when you want it, but in only 30 seconds, you can mount a vise, case trimming tools or your favorite press and get to work. Heavy duty 3/16 & 1/4 thick steel construction can take anything you can throw at it. Swapping out presses/tools takes less than 30 seconds and requires no tools. Note: This product requires that you router the bench in order for it to sit flush. If you do not wish to do this, the Base plate spacer (835-984, sold separately) must be used