1.HANDS-FREE DESIGN- This dosing funnel is well constructed and works perfectly on the 54mm portafilter. With a twisting lock, it attaches securely and is easy to connect and remove. There are grooves that are meant to slide into the chute, then the front tap auto-activates the grinder for a perfect dose.2.AVOID MESS AND WASTE - A Coffee Dosing Ring stops wasting coffee and prevents messes on your work top. With a coffee dosing funnel, all the coffee goes into the portafilter basket and significantly reduces the mess and difficulty in loading and tamping.3.AUTO GRIND AND EASY TO TAMP- With this dosing ring, you can activate the grinder with its front tap, allowing your machines auto dose feature to work as intended. Using this dosing ring makes it easier to tamp or distribute without spilling when the portafilter basket is overflowing with a heap of grounds.4.Aluminum alloy- coffee dosing funnel is made out of food grade Aluminum alloy. It is sturdy, will not rust or corrode and is safe for your familys health. You can flush wash with water and soap and it is dishwasher safe.