... ventilation grilleplastic ventilation grilleventilation grille designventilation ceiling grillesShaping Mode: plastic injection Mould Steel: S45C, P20, 718, 718H, 2738, 738H, NAK80, SKD61, E420 ... , etc. (For Reference)Mould Base: LKM or Self-made. Mould Components: HASCO, DME, PUNCH, JINHONG, etc (For Reference ...