Mounted Steel Brush made with .003" wire end shape has a 3/16" head dia. and 1/4" trim length, 3/32" shank, Style A-MB5. Made in USA. 25000 RPM Max Speed. Steel Brushes are suitable for use on all metal surfaces for removing rust and corrosion deburring cleaning edge blending and other surface texturing and preparation. Made with .003" and .005" wire.