The Bosch MRF01 Fixed Base comes equipped many new features. Trigger control system- trigger power switch located in handle for enhanced control (with lock-on button) conveniently located in handle for enhanced control. Versatile fixed base depth adjustment system for easy and precise bit depth adjustment. Features 1-5/8-Inch continuous microfine adjustment through top of optional router table. Macro and micro fine adjustment system with resettable depth indicator for fast, precise bit depth adjustment. Large 3-3/4-Inch base opening and a 2-Inch sub-base opening accepts larger bits, and provides better viewing visibility. Precision centering design makes it easy to keep bit on intended cut line when using jigs, templates, dovetail fixtures and similar guidance devices. For use with MR23EVS Series Routers.