5 Inch (127 mm) DiaSelf-Generated Vacuum Dynorbital Supreme Random Orbital Sander .28 hp, 12,000 RPM, 3/16 Inch (5 mm) DiaOrbit, Rear Exhaust Self-Generated Vacuum Dynorbital Supreme includes low profile, premium urethane weight-mated sanding padReady for connection to optional portable self-contained dust collection system3/16 Inch (5 mm) diameter orbit. Dynorbital Supreme models run at 12,000 RPMRotor utilizes five blades and produces more useable powerComposite rotor is stronger and has better lubricating qualities, enabling blades to last longer. Composite base has integrated rubber over-mold creating a non-slip feel, as well as insulating from coldThe air motor is suspended by vibration-absorbing rubber rings (Patent No5,319,888) to minimize vibration. Triple-sealed front double row balancer bearing (Patent No4,854,085) is guarded from sanding residue for long life and lower maintenance easy replacement using 57098 Repair Kit. Anti-clog design (Patent No5,319,888) enhances the vacuum pick-up on self-generated modelsDust particles are directed away from the air motor (reducing contamination) following a smoother, easier path of extractionComfort Platform provides additional hand and wrist support, further enhancing operator comfortAlso offers increased protection against cold air exhaust(NOTE: Comfort Platform is removable.) Order 59330 Comfort Platform (U.SPatent NoD610,428) separately, to install on existing tools! Product Information Brand Dynabrade Part # 56818 Origin Country United States Product Type Orbital Sanders RPM 12000 Spindle Thread 5/16 Inch - 24 Female