Amazon.com: Ball Bearing, Durable Double Shielded Ball Bearing Convenient for General Purpose for Factory for Professional Use for Electronic Component(12 * 18 * 4mm, (6701-2rs)) : Industrial & Scientific
203-KRR
Amazon.com: Replacement Bearing, S6004ZZ Deep Groove Ball Bearing 204212 mm (10PCS) ABEC-1 S6004 Z ZZ S 6004 440C Stainless Steel S6004Z Ball Bearings : Industrial & Scientific