BDB5351
I. [נֶ֫קֶב] noun [masculine] technical term of jeweller's work, probably some hole or cavity (Hi-Sm Co Berthol; ToyHpt leaves untranslated), — only plural suffix תֻּפֶּיךָ וּנְקָבֶיךָ Ezek 28:13 thy sockets and thy grooves (Da), or thy settings and thy sockets.