Diffuser: Air outlet diameter: 4.65cm-4.35cm, the air outlet must be round.Perfect Design: The diffuser attachment enhances curls and waves for all hair types without disrupting the natural wave pattern.Easy Installation: Simply align the guides on the attachment and handle, then slide and clip on the top of the integrated drying brush to quickly and efficiently add volume. The powerful volume effect gives your hair a salon-grade blow-drying effect.Innovative Styling Tools: From curling irons and curling tongs to straighteners, hot air brushes, automatic curling irons, etc., Manufacturing high-quality styling tools for all hair types.