The key to a perfect shot of espresso is consistency. The quickest way to consistency is to eliminate (or control) as many variables in your prep process as possible. Our dosing rings are specifically designed to help eliminate the overflow of coffee grinds while dosing into your portafilter. Eliminating overflow helps you reduce mess, waste, and in turn, will result in much more consistent dosing weights. Specifications: *Material: stainless steel aluminum alloy *Diameter: 51mm/2in *Color: Silver Black *Weight: Appro. 500g A key variable in making a great shot of espresso is achieving a consistent tamp. Tamping your grounds unevenly, or with too little or too great of a tamping pressure, will cause the water to extract through your grounds inconsistently, resulting in poor quality espresso. Unevenly tamped grounds can cause cracks or channels in the coffee puck during extraction, and tamping too hard or too soft and cause the shot to pull too slow, or too fast. This adjustable coffee distribution tool and tamper is a simple and effective way to remove those variables from the equation. Use the distribution/leveling side to evenly distribute the grounds in your portafilter, then flip to the adjustable tamper side for a uniform tamp, every time. Quick, easy and consistent.