Key Features: Hands-Free Operation: Simply twist the dosing ring onto your 54mm portafilter, allowing for a secure fit and effortless hands-free grinding, ensuring a seamless workflow. Minimizes Waste & Mess: Holds a full 21-gram shot, preventing spills and waste during coffee grinding. Keep your counter clean and maximize your coffee grounds. Effortless Tamping: Designed to allow you to tamp coffee grounds directly in your portafilter without needing to remove the dosing ring, ensuring consistent results. Durable Aluminum Alloy Build: Crafted from high-quality aluminum alloy for long-lasting use, providing a sturdy and reliable tool that will stand the test of time.