Orbital Action. Versatile. Adapts to all functions from heavy duty to finishing. Excellent for leveling or planing with over 45 square inches of full contact sanding enforced by 5-point suspension system and Hutchins powerful, Air-Efficient motor. Now equipped with a vacuum swivel port to make the sander more comfortable and reduce vacuum hose kinking. If you choose to use the sander with a bag, you need to purchase either connector Part No. 5301-2 or connector Part No. 5301-1 and bag assembly 1350-4 depending on your model. These models can be used either with a vacuum system or as a Self-Gen (with a collection bag). Pad size 4 1/2" x 16".