Our quality brushes have a steel hub with 3/32 mandrel arbor for flex-shaft machines. Miniature brushes are great for cleaning and polishing hard-to-reach areas. Overall length is 1-3/4. Sold in packages of 6. These mounted brushes have a 3/4 diameter brass brush which works best for gold, copper and brass. It is non-sparking, softer than steel and won't scratch soft metals.
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