The Extended Portaflter Hook extends 5mm more towards the front of the grinder compared to the factory provided part. This hook works particulary well with smaller single boiler espresso machines like a La Pavoni that has a 49mm portafilter. The hook allows for better distribution of the coffee grinds and more coffee straight in your basket! And less mess and waste on your coffee bar too! The Extended Portafilter Hook is an inexpensive upgrade for better performance in smaller portafiter espresso machines.