BK1212 Closed End Needle Bearing 12x18x12BK1212 Closed End Needle Roller Bearing Shell Type 12mm x 18mm x 12mm BK1212 Closed End Needle Roller Bearing, each bearing has 2 Rubber Seals to protect the bearing from dust or any possible contamination, Bearing inner diameter is 12mm, Bearing outer diameter is 18mm and Bearing width is 12mm. Item: BK1212 Closed End Roller Bearing Type: Needle Roller Bearing Size: 12mm x 18mm x 12mm Bearing Inner Diameter: 12mm Bearing Outer Diameter: 18mm Bearing