4" W x 4-1/2" L (102 mm x 114 mm) Dynabug "Model T" Orbital Sander, Central Vacuum 20,000 RPM, 3/32" (2 mm) Dia. Orbit, Rear Exhaust, Hook-Face Pad 3/32" diameter orbital action is ideal for fine finishes. Lightweight only 1 lb! Palm-style, ergonomic design features low profile grip for greater operator comfort and control. Operates 8-9 SCFM at 90 PSIG. Can be run by as little as 3 horsepower compressor. Low maintenance; easy to repair. Turbine-style vaneless air motor needs no oil! Easy interchangeable sanding pads. Uses reattachable and PSA (adhesive-backed) abrasive sheets and discs; coated and non-woven nylon. Has 1" outside diameter vacuum port for easy central vacuum connection. Includes 56285, 4-14" x 4-1/2", Hook-Face Pad