This Pearl Abrasive wire knot end brush is designed for cleaning and deburring internal passages, recessed areas, and spot-facing surfaces, as well as cleaning dies, molds, and tooling. Its 1-inch diameter, 0.014-inch wire, and 1/4-inch shank suit detailed brush work, with a maximum operating speed of 20,000 RPM. High-tensile-strength wire resists breakage, while industrial-grade construction supports durability and a long working life. ** WARNING:** This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.