Official La Marzocco Bottomless Portafilter (Walnut) Suitable to: La Marzocco, Faema, Brasilia B61, Aurora-Brugnetti, Casadio, Futurmat. This is a 58mm bottomless (naked) Details: This naked bottomless has 2 straight lugs It comes with a 27mm stainless steel filter basket that holds up to 21 grams for really creamy pours. Handy if you want to use a larger mug/Glass or if you just want a super crema. You can see if you have correctly tamped the coffee, used too little or to much coffee or if the grind is off.