Breville 54mm - Two Cup - Single Wall Filter - BES870XL/11.11 2 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