Dynabrade 69105 Dynorbital Silver Supreme Non-Vacuum Random Orbital Sander, 3-Inch Optional vacuum conversion kits are available to easily convert non-vacuum tool to self-generated vacuum tool or central vacuum tool Floating rotor utilizes five blades, producing more usable power. Less air is used more efficiently to maintain maximum power Comfort Platform provides additional hand and wrist support. Also offers increased protection against cold air exhaust Throttle lever recesses into housing grip when depressed, eliminating pressure-point on operator's palm For high production usage. Enhanced ergonomic features. Steel cylinder and end plates increase motor efficiency. Efficient vacuum capabilities