Its grinding head rotates 270 degrees. Fein's belt file, BF 10-280 E, is an electric tool with an output of 550 W that develops 28,000 RPM. It accommodates belts from 3⁄32 to 3⁄4 in. wide, and the handle rotates 180 degrees. Dynabrade's Dynafile ® and Dynabelter ® pneumatic tools, available in a multitude of variations, develop 5,000 ...