Metal machining and stamping insert Surface :BO/ Zn SGS audited More than 20 ... 1,Name:Metal machining and stamping insert;metal insert;machining and stamping insert 2,For the similar insert,what can we do ?(1), ... Ability for the material of this kind of insert: Grade3.6,4.6,4.8,5.6,6. ... industry is machined hardware fastener ,especially the cutting/turning parts. Metal machining and stamping insert