Comprehensive Set: This package includes 12 high-quality stainless steel wire bore brushes, ranging in size from 5/16 inch (8mm) to 1-3/16 inch (30mm). Each size is designed to meet various cleaning needs, ensuring you have the right tool for cleaning surfaces and cavities. Construction: These brushes feature a nickel-plated shank for enhanced rust resistance and long-lasting performance. The stainless steel bristles are arranged in a twisted wire configuration, providing increased strength and durability for demanding cleaning tasks. Universal Compatibility: Equipped with a standard 1/4 inch hex shank, these brushes are compatible with most driver handles, power drills, and die grinders. This design allows for easy attachment and smooth transitions between tools, enabling efficient cleaning. Versatile Use: Ideal for accessing narrow holes and tight spaces, these brushes effectively remove dust, rust, and debris. They are also suitable for polishing pipes, ports, and bearings, making them a practical addition to any maintenance or repair toolkit. Usage Guidelines: For optimal performance and brush longevity, use in a push-pull motion with a compatible drill or die grinder. Avoid counterclockwise rotation and operate at speeds below 600 rpm to prevent damage to the brush or work surface. Color: As shown Material: Stainless steel Size: 8/9/10/11/13/16/18/19/22/25/28/30mm Package Contents: 12 x Stainless steel bore brushes Note: Light reflection and differences in display screens may cause slight variations in the color of the item shown. Measurement may vary by up to +/- 1-3cm.