Wear on a metal can be naturally found in components that operate in a friction environment. such as in a transmission system. However. it can be a substantial problem when the wear rate is not within the permitted limit. https://safeersappliancers.shop/product-category/siemens-ku20wvhf0g-iq-500-built-in-f-wine-cooler-fits-21-bottles-black-new/