Breville .BES870XL/11.10 One Cup Single Wall Filter, 54mm One Cup Single Wall filter (non-pressurized) 54mm (2-1/8") diameter portafilter baskets Fit these Breville Espresso Machines: BES860XL, BES840, BES840XL, BES870XL Portafilter baskets are not one size fits all so double check your diameter in millimeters