Remove burrs, rust, dust, and oxide layer. Coating improves the quality of metal finishing; economical and efficient. Ideal for polishing and grinding rough surfaces on wood and metal at various angles. Suitable for most black and non-ferrous metals, castings, welded joints, rivets, rust removal, stone, and glass. Excellent for detailed work on a variety of fine materials. Compatible with most rotating tools. Effective on jade, ceramic, glass, wood, hardened steel, cast iron, stainless steel, and intricate details. Color: Silver + Gold Material: Brass + Stainless Steel Pencil wire brush size: 5mm Wheel steel brush: 25mm Cup steel brush: 15mm Package Contents: 12 x gold brass pencil wire brushes 12 x silver brass pencil wire brushes 6 x brass wheel steel brushes 6 x silver wheel steel brushes 4 x brass cup steel brushes 4 x silver cup steel brushes Content limited to items listed above; other products not included. Note: Lighting and display differences may cause slight color variations between image and actual item. Measurement error allowance: +/- 1-3cm.