Description: 51/53/58mm Espresso Dosing Funnel Stainless Steel Coffee Dosing Rings. Avoid Mess and Waste: Coffee Dosing Rings stop wasting coffee and messing up your work top with a coffee dosing funnel all the coffee goes into the portafilter basket severely reduces the mess and difficulty in loading and tamping. Safe Material: Made of premium aluminium alloy non-rust and anti-corrosion food grade material safe to your familys health. Easy to Clean and Use: You just rinse it with water and clean it with brush or sponge; As for use you simply place the funnel atop of your portafilter while grinding distributing and tamping and removed funnel quickly when finished. Convenient to Use: The stainless steel dosing Rings features lightweight and portable which makes it easy to use and install offer you much convenience. Specification: Material: Aluminum Size Chart: Inner Diameter: 51mm/2.01inch Outer Diameter:66.8mm/2.63inch Height: 18.1mm/0.71inch Package Includes: 1x Coffee Dosing Rings Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors the picture may not reflect the actual color of the item. 3. Wish you a wonderful on-line shopping!