DeWalt DW4910S Knotted Wire Cup Brush, Carbon SteelKnotted Wire Cup Brush are constructed with an internal holding plate to ensure consistency and safety. Excellent for rust and paint removal. Highlights: Diameter: 3 inch Material: Carbon Steel Arbor Size: 5 8 inch 11 Spindle Constructed with internal holding plate to ensure consistency & safety Constructed for even balance which provides smooth performance WARNING: Some dust created by power sanding sawing grinding drilling and other construction