6" knot wire wheel. 6". Use on bench grinder for heavy-duty weld cleaning and metal preperation. Removes rust, paint, and carbon. Excellent for cleaning grooves and corners. Coarse wire. 5/8" - 1/2" arbor. Maximum speed 9000 RPM. Diameter: 6", Arbor Size: 5/8" to 1/2", Wire Style: Twisted, Coarse Wire