Mounted Brass or Steel Brushes 3/32″ (2.35mm) shank. These are available in packs of 12 or 24. Brushes are for use on all metal surfaces for removing rust and corrosion, de-burring, cleaning, edge blending, and other surface texturing and preparation. 25,000 RPM Max Speed. Measurements are in Millimeters Part No. – Wire Bristle- Size – Pack QuantityWheel-Shape DiameterA-MB27-12 – Brass – 19 mm – 12-packA-MB62-12 – Brass – 22 mm – 12-packA-MB71-12 – Steel – 19 mm – 12-packA-MB72-12 – Steel – 22 mm – 12-pack End Brushes Diameter x LengthA-MB41-24 – Brass – 4.8 x 9.5 mm – 24-packA-MB51-24 – Steel – 4.8 x 9.5 mm – 24-pack Cup Brushes Diameter x LengthA-MB14-12 – Brass – 2 x 9.5 mm- 12-packA-MB15-12 – Steel – 12 x 9.5 mm – 12-pack WARNING for Brass Brushes: This product can expose you to lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov SKU: A-MB41-24 UPC: 098666080184 Brand: ORO MPN: 0051-0108 Micro-Tools makes every attempt to provide accurate information for each item. Actual packaging and/or specifications may be slightly different from the information and picture provided.C012P