The ECM Bottomless Angled Portafilter is 58mm in diameter and made from chrome-plated brass. The angled handle allows for more comfortable gripping and ergonomic use. To accentuate the aesthetics of your ECM espresso machine, the handles are made from smooth and glossy bakelite plastic. 58mm in Diameter Includes a Triple Shot Basket / Increases Cup Clearance by Approximately 1" Please Note: This portafilter is intended for use with ECM E61 group espresso machines and the ECM Casa V. It is also cross compatible with most E61 brew groups used by other manufacturers. This portafilter is not compatible with machines from the following brands: Bezzera (machines with a BZ style brew group) Breville Gaggia