This is an authentic replacement part sourced directly from the manufacturer. The ball bearing is commonly found in power tools from Metabo, such as rotary hammers and electric drills. This part is made of metal, and is generally used to allow components to spin freely. It may be found in various locations in the machine, depending on ...Read moremodel. Please be aware that there are different ball bearings used in the machine. Refer to your parts diagram to be sure of ordering the correct part. This item is available as an individual replacement part.