For burnishing scratches from precious metals, making it possible to salvage many pieces without gold loss. Can also be used for burnishing over micro-porosity in castings. The head consists of 5 steel rollers that act as rotating mallets. Measures approximately 1-3/4″L with 3/32″ shank for use with handpiece. Burnishing tool that effectively removes porosity, pits or scratch marks on the inside of rings and bracelets.