Ball bearing construction. 0-2-7/16" plunge stroke with presetting of 3 plunge depths. Rack and pinion depth adjuster with magnified scale. Micro fine depth adjuster. Variable speed with electronic feedback circuitry that maintains constant speed under load and provides a soft start. Longer length collet system for better holding power and less run out. 1/2" collet capacity. Spindle lock. 10' rubber cord. 15A, 8000 to 22,000 RPM. Includes 1/4" and 1/2" collets, template guide bushing adapter, and 2 wrenches.