Specification AgeRangeDescription : adult Brand : KOKYLEZN BulletPoint1 : [Double Sealed Design] Equipped with double seals to prevent from entering and to conserve lubricant for smooth . BulletPoint2 : [Precise ] With a 12mm inner diameter, 21mm outer diameter, and 30mm height, these bearings are ideal for small 12mm shaft projects like 3d printers and engraving machines. BulletPoint3 : [sturdy and Versatile] Constructed from high quality bearing steel, these lm12uu bearings are great for hobbyists and enthusiasts working on diy projects. BulletPoint4 : [High Quality Bearing Steel] These liner-motion bearings ensure low noise and long service life for reliable performance. BulletPoint5 : [Multipurpose Use] This set includes 10 pieces of bearings suitable for various projects, offering versatility for different applications. Color : One Color ExternallyAssignedProductIdentifier : 7635563168558 IncludedComponents : No ItemName : KOKYLEZN 1pcs SDM30 30X45X64 Linear Ball Bearing Bush Bushing CNC Linear Bearings 30mm 3D Printer Parts CNC Parts ItemPackageDimensions_Height : 1 centimeters ItemPackageDimensions_Length : 3 centimeters ItemPackageDimensions_Width : 2 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : linear-ball-bearings Manufacturer : KOKYLEZN ModelName : XPAFONWLO ModelNumber : KOKYLEZN NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : KOKYLEZN ProductDescription : KOKYLEZN