Lessmann Knot Wheel Brush 115 x 12 x M14 x 0.35 LES472117 Knot Wheel Brushes for grinders, angle grinders and stationary machines, used in the preparation and re-working of bolt fillet and butt welds. They remove scale, rust, paint, slag, rubber residue and can be used for de-burring. Lessmann knotted brushes are filled with a special high tensile strength steel wire in order to meet the exacting requirements during use.Diameter. 115mm. Width. 12mm. Bore. M14. Wire Gauge. 0.35. Wire Type. Steel. Max. R.P.M. 12,500. LES472117