... screws with plastic head A. Screw Prosduct detail 1)MaterialCarbon Steel of grade, SUS201, SUS303, SUS302, SUS304,SUS316 and etc. ... Inspection equipment: Hardness test, torque test, salt spary endurance test, mechanical sizes test, ROHS report Mill test certification and etc as ... complaint. We have the responsible QC, Engineers and after sale worker to deal with such things.In case this thing happened ...