Double headed pin hole hollow groove brass coating Gallery Double headed pin hole hollow groove brass coating Cold Forming Double headed pin hole hollow groove brass coating Ric Sun2020-06-16T01:52:30-07:00 Double headed pin inserted into receiving holes, the pin holds together parts of an assembly with friction. They [...] Double headed pin hole hollow groove brass coatingRic Sun2020-06-16T01:52:30-07:00