Bosch MRP01 Router Plunge Base for MR23-Series Routers Plunge base with fine adjustment knob and on/off switch located in the handle Trigger control system conveniently located in handle for enhanced control Afterlock microfine depth adjustment for easy and precise bit depth adjustment at any plunge setting Smooth plunge action, spring-lock plunge lever and depth rod for easy and precise plunge routing Wide 3-5/16-Inch base opening and 2-Inch sub-base opening accepts larger bits