Specification Brand : POLISI3D BulletPoint1 : Suitable for Ender 3 series, cr10 series ,Creality CR-10S series 3D Printer and other NEMA 17 stepper motors (for 5mm to 8mm shaft diameter) BulletPoint2 : it also can be used with other 3D printers and CNC machines which are using 5mm shaft motor to 8mm lead screw. BulletPoint3 : Size: OD20mm x 25mm L; Material: aluminum BulletPoint4 : Package: 4pcs Color : Silver DriveSystem : Shaft Drive ExternallyAssignedProductIdentifier1 : 791548326669 ExternallyAssignedProductIdentifier2 : 0791548326669 GpsrSafetyAttestation : 1 GradeRating : industrial ItemName : 4pcs Updated Flexible Couplings 5mm to 8mm NEMA 17 Shaft Compatible with Creality Ender3 Series, Ender 3 V3 SE KE, CR10 SE 3D Printer and Other 3D Printer ItemPackageDimensions_Height : 6.3 centimeters ItemPackageDimensions_Length : 2.2 centimeters ItemPackageDimensions_Width : 6 centimeters ItemTypeKeyword : 3d-printer-accessories Manufacturer : POLISI3D Material : Stainless Steel MetalType : Aluminum ModelNumber : 5x8 Coupler NumberOfItems : 4 NumberOfPieces : 4 PartNumber : 5x8 Coupler ProductDescription : Size: OD20mm x 25mm L; Material: aluminum ProductSiteLaunchDate : 2020-08-11T11:07:14.472Z SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 31161500