[Comprehensive Multi-size Kit]This kit features 14 pieces with a 12-inch long handle, including both brass and stainless steel brushes. Available in diameters: 6mm/0.2", 8mm/0.3", 10mm/0.4", 12mm/0.4", 15mm/0.5", 20mm/0.7", 22mm/0.9", it caters to different cleaning needs. [Essential Usage Tips]The brushes are coated with lubricating oil during production to maintain wire stability, which might leave a slight odor and residue. Use paint thinner for initial cleaning. For optimal performance, use the brushes in a clockwise direction to prevent unwinding and shedding. [Versatile Cleaning Tool]Ideal for cleaning metal straws, test tubes, and more, this wire cleaning brush set is perfect for and stubborn stains. It's also suitable for polishing, painting, rust removal, and burr cleaning in automotive and machining applications. [Long and Narrow Reach]Featuring a 2.2mm thick spiral knotted wire handle, these brushes are tough and firm, designed to reach narrow tubes and confined areas. Each brush includes a hanging ring for convenient storage and easy transport. Color: As Shown Material: Metal Package Contents: 14pcs Brass Wire Brush Stainless Steel Tube Brush Set(6mm/8mm/10mm/12mm/15mm/20mm/22mm) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.