Specification Brand : POLISI3D BulletPoint1 : Lead means Nut turn one circle,How far the screw forwards BulletPoint2 : POM material is durable and silent. BulletPoint3 : Color is black BulletPoint4 : Package: 2 sets POM nut kit like the first photo shows BulletPoint5 : 8mm lead of thread is with 4 starts; 4mm lead is with 2 starts, 2mm lead is with 1starts Color : black DriveSystem : Square ExteriorFinish1 : Stainless Steel ExteriorFinish2 : Copper ExteriorFinish3 : Brass ExternallyAssignedProductIdentifier1 : 791300409913 ExternallyAssignedProductIdentifier2 : 0791300409913 ItemName : 2-Pack 3D Printer TR8x8 T8 Pitch 2mm POM Anti Backlash Nuts for Lead 8mm Acme Threaded Rod Eliminate The Gap Spring DIY CNC Accessories (8mm Lead of Thread) ItemPackageDimensions_Height : 11.684 centimeters ItemPackageDimensions_Length : 1.016 centimeters ItemPackageDimensions_Width : 8.128 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : linear-motion-lead-screws Manufacturer : POLISI3D Material : Acetal MeasurementSystem : Metric MetalType : Stainless Steel ModelNumber : T8 POM NumberOfItems : 1 NumberOfPieces : 4 PartNumber : T8 POM ProductDescription : Item: T8 nut. Material: POM. Package: 2Set. ProductSiteLaunchDate : 2019-08-25T07:00:00.000Z Size : 150mm Style : 8mm Lead of Thread SupplierDeclaredDgHzRegulation : not_applicable UnitCount : 1