Outfitting your CNC machine with a fixture plate has quite a few benefits: Increasing the workholding, clamping and setup area Convenience of having hundreds (on our larger plates, thousands!) of bored and tapped holes versus a few t-slots Indexing, shifting, locating and holding large parts Clamping large parts outside of the machining envelope Using the SMW Mod Vise low profile, modular work holding system! Protecting the CNC machine table (often made from soft cast iron) Quickly aligning, tramming, and clamping vises and other workholding devices Using custom, hot-swappable fixture plates tops (i.e. pallets)