Dynabrade 56815 Dynorbital Supreme Non-Vacuum Random Orbital Sander, 5-Inch Optional vacuum conversion kits available, to easily convert non-vacuum tool to self-generated vacuum tool or central vacuum tool Rotor utilizes five blades and produces more useable power. Composite rotor is stronger and has better lubricating qualities Composite base has integrated rubber over-mold creating a non-slip feel, as well as insulating from cold Triple-sealed front double row balancer bearing is guarded from sanding residue for long life and lower maintenance; easy replacement Comfort Platform provides additional hand and wrist support. Also offers increased protection against cold air exhaust