Shank diameter: 3 mm Do not run in excess of 10,000 RPM. Worked well and lasted much longer at the lower speed. New 60 Pieces brass cleaning brush kit They will fit your hand drill, drill press & your Dremel and Foredom tool with a 3mm collet Removes rust and corrosion - Use on items made of brass, copper, gold or other soft ferrous metals-such as tools, door knobs, automobile parts and electrical contacts

Shank diameter: 3 mm

Do not run in excess of 10,000 RPM

New 60 Pieces brass cleaning brush kit

They will fit your hand drill, drill press & your Dremel and Foredom tool with a 3mm collet

Removes rust and corrosion - Use on items made of brass, copper, gold or other soft ferrous metals-such as tools, door knobs, automobile parts and electrical contacts