Specification Brand : Othmro BulletPoint1 : Model: LM12LUU BulletPoint2 : Inner Diameter 12mm , Outer Diameter 21mm , Total Length 57mm BulletPoint3 : Light-weight housing and Chromium Steel bearing ball, good abrasion resistance, high precision and good strength BulletPoint4 : Smooth moving, low friction, high rigidity and long working life BulletPoint5 : Suitable for kinds of electronic equipment/guide bar, drive shaft, and pillar ExternallyAssignedProductIdentifier1 : 0635393623590 ExternallyAssignedProductIdentifier2 : 635393623590 ItemName : Othmro LMH12LUU Linear Ball Bearings Inner Diameter 12mm 2 Pcs ItemPackageDimensions_Height : 12.7 centimeters ItemPackageDimensions_Length : 2.54 centimeters ItemPackageDimensions_Width : 8.382 centimeters ItemTypeKeyword : linear-ball-bearings Manufacturer : Othmro Material : Steel ModelNumber : OTH191111Z-0204 NumberOfItems : 1 PartNumber : OTH191111Z-0204 ProductDescription : Reliable friction characteristics that do not increase over the life of the bearing. Great for you to replace the damaged Ball Bearings in your devices to improve them efficiency and save energy.