Super Precision Ball Bearing 7906CYU/GLP4 Nachi Angular Ball Bearing Phenolic cage, Flush ground single units 15 degrees Contact Angle Abec-7 30mm x 47mm x 9mm Made in Japan 7906CYU/GLP4 Nachi super precision Angular Ball Bearing with 15 degrees contact angle and Phenolic cage, bearing is ABEC-7 (P4) quality and made in Japan. inner diameter is 30mm, outer diameter is 47mm and width is 9mm.