Up for sale is genuine NSK ball bearing for Mitsubishi alternators and other applications requiring a bearing size of 17 mm (inner diameter) x 52 mm (outer diameter) x 18 mm (thickness). It is made in Japan and guaranteed authentic and genuine. When choosing a bearing for automotive use, you don't want to use cheap, low quality, no-name brands or counterfeit bearings as their use could endanger property or lives. NSK is a trusted brand/manufacturer of quality bearings that meet or exceed OEM specifications.