Made of aluminum, this dose ring is strong and durable. (for 51mm handle) Aluminum material will not rust. Thanks to the small magnets, the dosage ring does not and ensures a particularly stable fixation. filters 51mm are made of multi-layer sintered stainless steel 316L. Compared to 304 stainless steel, 316L is more sustainable at high temperatures.With dosing ring, it significantly reduces the annoying scattering of coffee grounds when grinding directly into the handle. Especially helpful for electrostatic . 150m disc filter can enhance the coffee more effectively than other 50m disc filters while ensuring the filtering effect, and is more suitable for espresso machines.The coffee dose ring can be wiped quickly with a brush, sponge, etc. or simply wiped with a damp cloth. The 150 Micrometre filter simply rinses under running water to remove any dirt inside. -friendly, durable and reusable. Note: Not dishwasher safe.Filling funnel fits most 51mm filters. NOTE: It is not compatible with some coffee . Compatible with Portafilter , Bezzera BZ10. measure the inside diameter of your handle and dosing ring purchasing.It is perfect for coffee machines and suitable for grinding coffee in cafes, , restaurants and more. Small size, light weight, exquisite workmanship. Easy to carry.color:Photo colorMaterial:aluminum+stainless steelPackage Contents:1 x metering ring1 x filterOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.