Specifications: Wheel Brush Diameter: 25mm/ 1” Cup Brush Diameter: 20mm/ 0.78” Pen Brush Diameter: 7mm/ 0.27” Shank Diameter: 3mm/ 1/8” Color: Silver Wheel Material: Stainless Steel Wire Backing Material: Nickel Plated Carbon Steel Features: Good for rust removal, paint stripping, deburring sharp edges, edge blending Can be used for wood sanding and wire drawing, polishing and texturing of metal and non-metal. Easy to access into narrow holes and confined areas, great for removing burrs, rust, dust, removing the oxide layer. Suitable to use on Dremel tools, electric drill, hand drill, drill press, power drill and pneumatic air drill. Package Contents: (45pcs Wire Wheel Brushes) 15 x Steel Wire Cup Brushes (Silver Tone) 15 x Steel Wire Wheel Brushes (Silver Tone) 15 x Steel Wire Pen Brushes (Silver Tone) Note: Before use the wire brushes set, wear safety glasses or other protective equipment.