... to install diffuser neck size,plastic diffuser with neck adjustable ceiling diffuser hvac plastic diffusers ... with neckShaping Mode: plastic injection Mould Steel: S45C, P20, 718, 718H, 2738, 738H, NAK80, SKD61, E420, etc. (For Reference ... HASCO, DME, PUNCH, JINHONG, etc (For Reference)Hot Runner: YUDO, HASCO, M-H-R, etc ... (For Reference)Main Software: AutoCAD, UG, CATIA, Solid works ...