Designed For54mm dosing funnel coffee dosing ring for barista portafilters accessories.Durable: Coffee dosing ring is made of top quality PP material, sturdy and strong, great durablity, and food grade.Perfectlt Fitted: Just twists to lock onto your 54mm portafilters, which can tightly fit to prevent the powder from overflowing during operation. Countertop Tidy: Coffee dosing funnel effectively prevents powder from spreading, no more mess and spill over grounds on your countertops.Easy to Clean: Convenient, you just rinse it with water and clean. Specification: Material: PP Size Chart: Bottom Outer Diamter: 8.3cm /3.27inchBottom Inner Diamter: 7.7cm /3.03inchHeight: 3.8cm /1.50inch Top Outer Diamter: 6.1cm /2.40inchTop Inner Diamter: 5.5cm /2.17inch Package Includes: 1 CoffeeDosing Ring 54mm Note: Please allow slightly errors due to manual measurement and different monitors.