The very narrow face allows access to hard-to-reach areas. Each knot is twisted through its own hole and locked into an individual sprocket tooth (Roughneck Patented Construction). This prevents the knots from moving and allows them to have stronger striking action on the work surface. Uses: Cleaning rust, scale and oxidation; Deburring; Weld Cleaning; Roughening Surfaces; Edge Blending; Surface Preparation. Wire Material:Steel; Wire Size:0.0200"; Diameter:6"; Arbor Thread - TPI or Pitch :5/8 in-11 UNC; Number of Knots:56; Face Width:3/16"; Face Plate Thickness:7/16"; Trim Length:1 1/8"; Speed:12500 rpm [Max].