Linear Motion Guideway 4x24x10mm Clear Track V-Slot Profile Roller Bearing Inner Diameter - 0.64 inch (0.64") 6021-2NSENR Nachi Bearing with a

6021-2NSENR Nachi Bearing with a Snap Ring

32040 Tapered Roller Wheel Bearing

outer diameter is 12mm and the width is 3

you need to buy the VXB009C200BTWFSPU in order to get one :)

Linear Motion Guideway 4x24x10mm Clear Track V-Slot Profile Roller Bearing Inner Diameter - 0.64 inch (0.64") 6021-2NSENR Nachi Bearing with aLinear Motion Guideway V Slot Profile 4mm x 24mm x 10mm Track Roller One Clear Polycarbonate Rubber Bearing Linear Motion Guideway 4x24x10mm Track Roller Bearing. Linear Motion Bearing Guideway clear Polycarbonate Bearing Track Roller Bearing Dimensions: 4mm x 24mm x 10mm Quantity: 1 Bearing Rail is not Included