... and best service 3. fast delivery customized injection plastic learning machine shell WT- Common norms reference: Mold typePlastic injection mold, Die ... , P20, NAK80, SKD61Heat hard, H13 Heat hard , S136 heat hard, 420(heat hard) 8407(heat hard), Cr12, CrWMn ,etc.Runner type ... parts, die casting parts, machining parts, (from: 50T~500T injection machine, also can do the 550T~1800T molding small QTY ) l ...