Description 51mm Adjustable Coffee Distributor-51mm base designed to work with the 51mm portafilter baskets. 53mm Adjustable Coffee Distributor-53mm base designed to work with Breville 54mm portafilter baskets, including the Barista Express, Pro, Touch, Bambino Plus, Infuser and Duo-Temp Pro. 58mm Adjustable Coffee Distributor-58mm base designed to work with most portafilters and espresso machine models including: Breville, Rancilio, Gaggia, La Pavoni, Hamilton Beach, ECM, La Marzocco, Rocket, Alex Duetto, Astoria and all E61 group machines. Low profile makes it easier for barista to tamp with straight arm at 90 degrees to the counter. Evenly redistributes coffee grounds and provide a larger flat surface area for the barista to apply an even tamping pressure using the palm of the hand which helps with control and consistency. Height is adjustable by it's screw mechanism (no grub screws, shims, or allen keys required) to suit different doses or baskets. Solid Food Stainless Steel Base enable you to feel reassurance when you make espresso. Anti-slip Aluminum Alloy handle is perfect for hand use. Anti-rust design, its pretty delicate with premium material and exquisite appearance.