Flat top design for easy bit changes and adjustments 1/4" and 1/2" collet capacity.  Precision machined aluminum motor housing and round base.  Self-release collet system ends "frozen" bits.  Micrometer dial depth-of-cut adjustment with a 3-1/2" diameter motor.  Non-marking base.  100% sealed ball bearings.  Standard Equipment: Motor, base, 1/4" collet, 1/2" collet, 2 collet wrenches, and operating manual.  UL listed, CSA certified and meets OSHA requirements.