Amazon.com: 12mm id bearing
Aopin LM12UU Cylinder Linear Motion Ball Bearing, ID 12mm, OD 21mm Linear Ball Bearings Sae52100 Carbon Steel, 4 Rows of Steel Balls, Great for CNC, 3D Printer, Linear Rail Guide 12 PCS. 22.08 22. 08 (1.84/Item) 5% coupon applied at checkout Save 5% with coupon. Get it as soon as Tue, May 18.
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