6 x (5/8-1/2) Knot Twisted Wire Wheel - Unthreaded (550303) These high performance brushes are made from top quality USA high carbon steel wire for maximum performance and life Full cable twist brushes are made with tightly wound, low flex tufts which offer a very aggressive high impact brushing action with best control at the surface contact area The best brush for weld cleaning, weld spatter and scale removal, cleaning, deburring and flash removal where surface finish is a low priority Also used in pipe joining for cleaning scale and spatter following welding Available in high quality carbon steel 6" and 8" brushes come with round center holes for use on end grinders and bench grinders - 3-1/4" brush is popular in the automotive trades for use on die grinders Specifications: Diameter (inches) 6 Thread Size (inches) 5/8 - 1/2 Face Width (inches) 1/2 Wire Diameter (inches) .020 Max. RPM 9,000 * All Pictures Shown Are For Illustration Purpose Only. Actual Product May Vary Due To Product Enhancement.