... metal corner brackets OEM servce hole perforated /punching metal sheet 1. iso9001-20002.manufacturer 3.thickness 2mm 4.hole ... :round,squareWe are a manufacturing enterprise specialized in product designing,mould designing,production manufacturing and assembling.Feature ... die,grinding,riveting,etc.2.Material: stainless steel, brass, copper, aluminum, iron(SGCC,SPCC,SECC),etc.3.Surface treatment: ...