3-3/4" base opening and 2" subbase opening accepts large bits,  Coarse and microfine adjustment knobs plus depth rod and turret, Soft-start reduces start-up torque,  Constant-ResponseTM Circuitry - - Maintains constant speed under load - Protects against overload,  Exclusive Precision Centering Design centers bit precisely,  Tool-free template guide adapter system for fast and easy template guide changes,  Dual-bearing plunge post for smooth and accurate plunging action,  Convenient front spindle lock for fast, easy bit changes,  Double insulated, UL listed, complies with OSHA, Converts easily for use with router table, includes 1/4" S. R. Collet Chuck, 1/2" S. R. Collet Chuck, 24mm Collet Nut Wrench, Tool-Free Template Guide Adapter, Dust Extraction Hood, Vacuum Hose Adapter, and Fine Adjustment Control Extension. Weight 18.6 lbs. Buy this tool from Hechinger Hardware for $302.18