Description To Fit Diva Pro Styling Atmos Dry Hairdryer only, please check the link to clarify the model of hair dryer. https://www.stockbyjulie.co.uk/product/diva-pro-atmos-dry/ This is not compatible with the Diva Pro Styling Atmos Atom as it has a smaller diameter shaft. To use with diffuser, ensure the dryer is switched off, then attach  by holding it magnet-side facing to the corresponding magnet on the front of the dryer barrel, until it secures in place. The dryer is then ready to use.