An end brush does the deburring, cleaning and surface finishing in corners, recesses and T-joints too tight for a wheel.
Both the SIT and the Rocket end brushes run crimped wire on a 6mm shank, for a die grinder or a drill. They're rated anywhere from 4,500rpm to 20,000rpm. The max RPM on the brush needs to sit at or above the tool's no-load speed, and the brush buyer's guide has the rest of the check.
