Espresso 58mm Dosing Ring Funnel

UPDATE: I have a newer version here.
We need coffee to sharpen our senses, but we need that same precision to make the coffee in the first place. It's a classic catch-22. Introducing a dosing ring funnel tool that ensures your espresso grounds end up exactly where they need to be. This tool is designed to fit a standard commercial size portafilter (58mm). Dimensions: 75.3mm x 29mm. Features contoured walls for better grip and reduced slipping. Please note, I only offer the 58mm size, as that's the only portafilter size I have for designing.