customized injection plastic learning machine shell 1.customized housing 2.high quality and best service 3 ... . fast delivery customized injection plastic learning machine shell WT- Common norms reference: Mold typePlastic injection mold, Die ... DME, etc.Steel718H, P20, NAK80, SKD61Heat hard, H13 Heat hard , S136 heat hard, 420(heat hard) 8407(heat hard), Cr12, CrWMn ,etc.Runner type:cold ...