Photo 1 of Aopin SCS12UU Linear Ball Bearing Aluminum Slide Block, ID 12mm Linear Motion Ball Bearings CNC Slide Bushing, 4 Rows of Steel Balls, Great for CNC, 3D Printer, Linear Rail Guide

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Photo 1 of Aopin SCS12UU Linear Ball Bearing Aluminum Slide Block, ID 12mm Linear Motion Ball Bearings CNC Slide Bushing, 4 Rows of Steel Balls, Great for CNC, 3D Printer, Linear Rail GuidePhoto 2 of Aopin SCS12UU Linear Ball Bearing Aluminum Slide Block, ID 12mm Linear Motion Ball Bearings CNC Slide Bushing, 4 Rows of Steel Balls, Great for CNC, 3D Printer, Linear Rail Guide