Angular-contact ceramic ball bearing, 3.175 x 5.98/6.35 x 2.38/2.78, stepped outer ring, extended inner ring

Angular-contact ceramic precision ball bearing with stepped outer ring and extended inner ring
Dimensions: 3.175 x 5.98/6.35 x 2.38/2.78
To be used for rotor KaVo 635 / 637, among others
Alternative for KaVo REF. 0.220.2015
Quality level: ISO P4P, ABEC 7/9
Made in Japan