The basket is of very good quality and it fits delonghi ecp 3420 very well. It probably fits well all delonghi models, but i have only that one to attest to. It makes a tasty espresso with good crema. The holes are round and uniform. They retain the coffee grounds even at crazy fine settings. I know it from experience.The only downside is that the basket walls begin to narrow down about 5-7mm from the bottom. The tamper wedges into the basket when using less than 13g of coffee. I wish the walls were parallel a bit further down towards the bottom in order to allow for 10-13g shots. On the top side, the limit is about 14-15g. above that the coffee puck begins to touch the shower screen after extraction.