Tamper and distributor 54mm: Double sides, one side is for leveling the coffee grounds and the other side is the force tamper. A must tool to have in order to get a consistent shot. Compatable with : all 54mm Portafilters baskets including Sage Barista Express, Barista Pro, Barista Touch, Bambino Plus, Duo-Temp Pro, Infuser and more. 51mm Coffee Distributor and tamper: It is very sturdy and it distributes the coffee grounds evenly before tamping, Less channelling by better coffee distribution gives more repeatable, better tasting espresso. Adjustable Depth: The black plastic rings can be rotated and the metal core basically extends out if you want a tighter compression. Material: 304 stainless steel base, solid metal, weighty construction. Free soft rubber mat included.