Unmounted brushes for cleaning hard-to-reach areas and for general cleaning and polishing. Each brush has a single row of natural bristles secured in a steel hub with a 3/32" or 1/8" hole for mounting onto a miniature mandrel. Available in stiff, medium, and extra soft, and in 2 diameters. Maximum speed 25,000 RPM. Brushes with 3/32" holes should be used with mandrels having 1/16" dia. screws. Brushes with 1/8" holes should be used with mandrels having 1/8" dia. screws. Sold by the piece.