... ,adjustable,easy to install diffuser neck size,plastic diffuser with neck adjustable ceiling diffuser hvac plastic diffusers supply ceiling diffuser square ... neckShaping Mode: plastic injection Mould Steel: S45C, P20, 718, 718H, 2738, 738H, NAK80, SKD61, E420, etc. (For Reference)Mould Base ... and the adaptors are separated in carton to save the room,the frames are packed 10pcs/carton, a poly bag for ...