This is the adaptor basket for the E61 group handle. It is a necessary accessory if you want to achieve optimal extraction times for the ESE Paper Coffee Pods using an E61 group handle. Please take into consideration that different brands of espresso machines have varying extractions even though they use the same E61 group handle format. Therefore our adaptor basket suitability recommendations are purely a guideline. We recommend purchasing a few different sized adapter baskets based on our guidelines and experimenting until you find the best fit for your machine.