... ceiling diffuser square ceiling diffuser with neckShaping Mode: plastic injection Mould Steel: S45C, P20, 718, 718H, 2738, 738H, NAK80, SKD61, E420, etc. (For ... -H-R, etc (For Reference)Main Software: AutoCAD, UG, CATIA, Solid works, etc Product Nameceiling diffuser,panel ceiling diffuser,all kinds of ceiling ...