The PB-3R is a Pocket Burnisher with 6 abrasive rods and 6 abrasive blades. A very convenient and handy pocket burnisher. Adjustment of flexible blade-length and rigidity - is possible by varying depth in chuck. It is supplied with replaceable blades stored in pen barrel at the opposite end. It is suitable for used to remove corrosion on relay and switch contact points. It is also ideal for all types of metal including platinum, silver, gold, molybdenum and tungsten.