M10 male threads into the portafilter body. This rubber grip handle will work with any 10 mm portafilter body. Removing your old portafilter handle can be difficult, as they are usually "thread-locked" into place from the factory, so you may want to consider purchasing the portafilter body as well.
WARNING: This product can expose you to chemicals including lead, which are known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to www.p65warnings.ca.gov.