The bore drill brushes have twisted wire tips flex to access narrow holes, welds, and tight machinery gaps. The wire drill brushes are great for removing light and otherwise conditioning steel and other metal without scratching surfaces, ideal for automotive parts, metal fabrication, and tool restoration The drill wire brushes are well-filled with crimped 0.012 Inch carbon steel wires, bound & balanced expertly & properly together for unsurpassed knotted integrity for longer life. All steel wires are firmly fixed to a safety-designed cup-shaped metal bracket to that the steel wires do not fall off quickly during high-intensity work [14 Pack Rotary Tool Wire Brush] The wire wheel with 1/4 inch hex shank contains 2" (50mm) carbon steel cup brush, 2" (50mm) wheel brush, 1" (25mm) pen brush, 8pcs 304 stainless steel bore brushes (include 8/10/12/15/17/19/22/25mm), 3pcs nylon/brass/stainless steel bristles, covering basically everything you need to clean up any type of metalwork 1/4" (6.35 mm) hex shank quick change shanks are use in all Types of drills and die grinders 4500 Max RPM. The 1/4" hex shank design makes the rotary tool wire brushes easier for fixing on a drill and improve the reliability of high-speed rotation that 't fall off easily like round shank . Easily and smoothly remove heavy , rust, paint, spatter and scale removal, such as hinges on doors and , large old keys, removing cement/mortar and paint from a walkway, resurfacing some cast iron pans, removing paint covering screws, stainless steel bbq grill grates., Weight: 0.440924524 pounds, Manufacturer: Prterver