The new Bosch RA1166 plunge base is for use with the Bosch 1617 & 1618 series router motors.  The depth adjustment system feature coarse and microfine bit depth adjustment with resettable indicators.  The RA1166 has a large 3-5/16-inch base openings with 2-inch subbase openings,  accepting larger bits and providing better visibility.  Motor positioning for right or left switch and cord locations provides both choice and consistency, as the motor does not rotate during depth adjustment.  Accepts the tool-free templet guide adapter which allows quick templet guide changes.  Multiple new optional accessories allow you to build a complete Bosch routing system. Weight 1.0 lbs.