Copper turning parts

In general, the inner hole tolerance can reach 0.02MM (0.03% for stainless steel or quick-cut steel products),
At the same time, the flat bottom hole can be hooked through a hook knife.
As well as drilling stepped holes (except eccentric holes) through the forming drill, the roughness of the inner hole can be up to 0.8.
According to customer drawings can develop all kinds of parts, turning pieces of non-standard hardware.
Left is a copper turning part,