Specification Brand : ReliaBot BulletPoint1 : The material is carbon steel, which is very suitable for linear motion rod. BulletPoint2 : The surface has been chrome plated to enhance the hardness. BulletPoint3 : Chamfer on both ends, easier to install linear bearings and won't hurt fingers when installing it. BulletPoint4 : Diameter 12mm, tolerance -0.005mm to -0.03mm ( 11.995mm - 11.97mm) BulletPoint5 : Length 400mm, tolerance ± 0.5mm ( 399.5mm - 400.5mm ) BulletPoint6 : Please note that minor debris may adhere to the inside of the film. Upon receipt, kindly perform a brief cleanup as necessary. Rest assured, this will not affect the performance of the product. Color : Black ExternallyAssignedProductIdentifier1 : 0700401394035 ExternallyAssignedProductIdentifier2 : 700401394035 ItemForm : Rod ItemName : ReliaBot 12mm x 400mm (.472 x 15.75 inches) Case Hardened Chrome Plated Linear Motion Rod Shaft Guide - Metric h8 Tolerance ItemPackageDimensions_Height : 41.91 centimeters ItemPackageDimensions_Length : 3.556 centimeters ItemPackageDimensions_Width : 3.556 centimeters ItemPackageQuantity : 1 ItemShape : Square ItemTypeKeyword : linear-motion-guides Manufacturer : ReliaBot Material : Carbon Steel, Chrome Plated ModelNumber : RD067 NumberOfItems : 1 PartNumber : RD067 ProductDescription : Packing List: 1 * Diameter 12mm linear rod 400mm long ProductSiteLaunchDate : 2018-09-18T07:00:00.000Z Size : Diameter 12mm Style : 400mm SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 UnspscCode : 24102000