Dynabrade Extreme Dynorbital is the most powerful air sander in the industry! Completely redesigned from top to bottom. Not only does this model have more power but there are big improvements in operator comfort, motor durability, and safety. Extreme sanders are Ideal for the finishing and deburring of metal, wood, composites, stone, marble, fillers, primers, and much more. Abrasive Disc Type: 5" x 5 hole Hook & Loop Discs Vacuum Type: Central Vacuum Backing Pad Diameter Inch (mm): 5" x 5 Hole (127) Tool Spindle Thread: 5/16 in.-24 Female Orbit Dia. (mm): 3/16 in. (5) Free Speed RPM: 12,000 hp (W): 0.3 (224) Exhaust Type: Rear Max. Air Flow @ 90 PSIG: SCFM (LPM): 19 (538) Hose I.D. Size Inch (mm): 1/4" (6) Length Inch (mm): 9.1" (230) Height Inch (mm): 3.7" (95) Weight (lbs): 1.94