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.