... surface 3.professional OEM factory 4. Small quantity wel sheet metal fold part1. Material:Carbon steel,stainless steel,copper ... ,chromated plated, electrophoresis, powder coating,etc3.Machine:Stamping machines,automatic stamping machine,punching machines,Oil Hydraulic pressing machines,bending ... requirements.5.Application: auto part, Medicine part, machine part, building part, household hardware, etc.