... Zhong Sheng Metal Products Co., Ltd!Name:speaker plates welding fabrication parts Features:1.Material:steel plate, A36, ... Q235,etc.2.Process:welding part, welded part, stamping, pressing, machining, fabrication 3 ... Tapping Machine,Drill Stand,Grinding machine etc.7.Test Equipment:CMM,Spectrometer,Metallurgical Structure, Strength Tester,Digital Micrometer,Thread ...