This is a listing for a 51mm distributor. The color is black. This size is commonly used with many home espresso machines like De'Longhi, and some other machines. Please check the basket size of your machine before purchasing. This item is used to improve the quality of espresso extraction by leveling the coffee grounds in the basket. It is a type that allows you to adjust the pressing depth, so you can adjust it to your preferred amount of coffee grounds. Due to the size, it will be shipped disassembled as shown in the fourth photo. (You will also disassemble it to make adjustments) It can be easily reassembled by screwing the top and bottom parts together.