Specification Brand : Akozon BulletPoint1 : This set comprises ten premium quality linear motion bearings, designed for quiet and extended service life. BulletPoint2 : Each bearing is encased in a double sealed design, preventing the intrusion of and retaining lubrication for smoother . BulletPoint3 : These bearings feature a 12mm inner diameter, a 21mm outer diameter, and a 30mm height. BulletPoint4 : Our LM12UU bearings are for small hobby 12mm shaft/rod projects like 3D printers, engraving s, and more. BulletPoint5 : With ten bearings in each set, you have ample supply for various projects. IncludedComponents : No ItemName : 10-Pack LM12UU 12mm Linear Motion Ball Bearing Bushings for 12mm Rod, Ideal for 3D Printers & CNC Parts ItemPackageDimensions_Height : 5 centimeters ItemPackageDimensions_Length : 9 centimeters ItemPackageDimensions_Width : 8 centimeters ItemTypeKeyword : linear-ball-bearings Manufacturer : Akozon ModelNumber : Akozon26ik7gb1cw NumberOfItems : 1 PartNumber : Akozon26ik7gb1cw ProductDescription : Specifications: