Specification Brand : LUORNG BulletPoint1 : Made of high-quality stainless steel, rustproof and wear-resistant, strong and durable. BulletPoint2 : Size: Inner diameter 8mm/0.315inch. Outer diameter 14mm/0.55inch. Height 7mm/0.28inch. BulletPoint3 : Allen fixed top wire with M4x4mm, flush with the collar surface. They are the best choice for collars because they can fix the collar to the shaft more efficiently BulletPoint4 : Available for T8 lead screws and shafts with a diameter of 8 mm. Widely used in 3D printers and other mechanical equipment. BulletPoint5 : The package contains: 12pcs T8 spindle locking rings + 12pcs M4x4mm Allen fixing screws. DriveSystem : Slotted ExteriorFinish : Brass FinishType : Polished ItemName : Lead Screw Lock LUORNG 12pcs Stainless Steel T8 8mm Bore Locking Ring Collar with 12pcs M4x4mm Allen Fixing Screws 3D Printer Parts ItemPackageDimensions_Height : 6.096 centimeters ItemPackageDimensions_Length : 1.6002 centimeters ItemPackageDimensions_Width : 4.4958 centimeters ItemPackageQuantity : 12 ItemTypeKeyword : linear-motion-lead-screws Manufacturer : LUORNG Material : Stainless Steel Material1 : Brass Material2 : Stainless Steel MetalType1 : Stainless Steel MetalType2 : Brass ModelNumber : 28246-LSLTBR-12 NumberOfBoxes : 1 NumberOfItems : 1 PartNumber : 28246-LSLTBR-12 ProductDescription : Name: T8 lead screw lock ring Material: high quality stainless steel Inner diameter: 8mm/0.315inch Outer diameter: 14mm/0.55inch Height: 7mm/0.28inch Ejector thread: M4 Top wire length: 4mm/0.16inch Suitable for T8 lead screws and shafts with a diameter of 8 mm Usage: 3D printer and other mechanical equipment.