Specification Brand : ReliaBot BulletPoint1 : Size: 45.7*27*10mm; the distance of the center of the threaded holes: 20*20mm BulletPoint2 : Threaded holes: 4-M3*3.5 BulletPoint3 : Been installed on the plastic rail in case of losing the steel balls BulletPoint4 : Come with 2 spare steel balls in the package for backup BulletPoint5 : There are are 2 anti-fall strips on each side of the block, which reduce the situation that the carriage block is stuck during shipping, and makes it lower noise when the carriage block is running on the guide rail. Color : Black ExternallyAssignedProductIdentifier : 1200065467469 ExternallyAssignedProductIdentifier1 : 788474317618 ExternallyAssignedProductIdentifier2 : 0788474317618 IncludedComponents : Rail ItemDisplayWeight : 0.5 kilograms ItemForm : Rod ItemName : ReliaBot Black MGN12H Carriage Block with Anti-Fall Strips for 12mm MGN12 Linear Motion Slide Rail Guide ItemPackageDimensions_Height : 10.1854 centimeters ItemPackageDimensions_Length : 1.016 centimeters ItemPackageDimensions_Width : 7.1882 centimeters ItemPackageQuantity : 1 ItemShape : Rectangular ItemTypeKeyword : linear-motion-guides Manufacturer : ReliaBot Material : Stainless Steel ModelNumber : RZ033 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : RZ033 ProductDescription : Packing list: 1 * MGN12H carriage block ProductSiteLaunchDate : 2019-12-05T13:43:49.816Z Size : MGN12H Block SpecificationMet : Iso 286-2 G6 Style : Carriage Block SupplierDeclaredDgHzRegulation : not_applicable SupplierDeclaredHasProductIdentifierExemption : 1 UnitCount : 1 UnspscCode : 31171500