Super Precision Ball Bearing 7909CYU/GLP4 Nachi Angular Ball Bearing Phenolic cage & Flush ground single unit 15 degrees Contact Angle Abec-7 45mm x 68mm x 12mm Made in Japan 7909CYU/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. 7909CYU/GLP4 inner diameter is 45mm, 7909CYU/GLP4 outer diameter is 68mm, 7909CYU/GLP4 width is 12mm.