Descrtion51mm 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 Expre, Pro, Touch, Bambino Plus, Infr and Duo-Temp Pro.58mm Adjustable Coffee Distributor-58mm base designed to work with most portafilters and espreo hine models including: Breville, Rancilio, Gaia, La Pavoni, Hamilton Beach, ECM, La Marzocco, Rocket, Alex Duetto, Astoria and all E61 group hines.Low profile es it easier for barista to tamp with sight 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 preure 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 Stainle Steel Base enable you to feel reaurance when you e espreo. Anti-sl Aluminum Alloy handle is perfect for hand . Anti-rust design, it's pretty delicate with premium material and exquisite appearance.