The choice of an electrode holder that will be lightweight, run cool, and at the least cost can be determined first by the maximum rod used and
second, by the maximum amperage setting used. BOSSWELL holder numbers indicate the amperage capacity. For example, an BW-500 holder has a
maximum amperage capacity of 500 amps. Match the holder to the rod and amperage used for greatest efficiency. it contains the body of half brass half cast iron.