Genuine Busch carbide ram rollers RR426F (36 facet) with roller diameter 6 mmfor hammering out porosity from gold, platinum and silver.These long lasting cylindrical burnishers are a fast and efficient way of removing porosity, scratches and fire scale from precious metal castings.Mounted on 3/32" (2.35mm) mandrels.Maximum working speed is 10,000 rpm. Made in Germany.
