Makita 3612C has a 0 - 2-3/8 plunge depth capacity for easy penetration into the workpiece. The 3612C offers multiple depth adjustments; presetting of 3 plunge depths. The Makita 3612C features an all ball bearing construction for long tool life Also featured is a shaft lock for quick and easy bit changes and a soft start feature for smoother start-ups. The 3612Cs variable speed selection knob (9000 - 23000 RPM) for more precise routing. An electronic speed control maintains constant speed even under heavy load.