Specification Brand : ANCIRS BulletPoint1 : 【Sturdy Material】 Ancirs coupling connector is made of fine plating steel, heat and electroplated process make it sturdiness and insulation, striking shaft more stable and easy for installment and replacement. BulletPoint2 : 【Wide Range of Use】Ancirs flange coupler is produced based on International Flange Standard, widely used in model shaft connection, perfect accessories for RC Model motor. BulletPoint3 : 【High cost performance】Ancirs flange coupler is packaged with 4 pack 7mm Flange Shaft Coupling + 4x M3 Mini Hex Wrench + 8 x M3 Fastening Screw. BulletPoint4 : 【Standard Specification】Inner Diameter: 7mm. Cylinder Outer Diameter: 10mm. Cylinder Height: 10mm. Base Diameter: 22mm. Base Height: 2mm. BulletPoint5 : 【Satisfaction Guarantee】 If you are not completely satisfied with ANCIRS Flange Coupling Connector, just contact us through Amazon message and we will provide feasible solution for you as promised. Color : Gold ConnectorType : Coaxial CustomerPackageType : Standard Packaging DriveSystem : External Hex ExteriorFinish : Silver ExternallyAssignedProductIdentifier : 10601986149003 ExternallyAssignedProductIdentifier1 : 717877039346 ExternallyAssignedProductIdentifier2 : 0717877039346 FinishType : Brass,Gold GpsrSafetyAttestation : 1 IncludedComponents : 1/2"EMT Set Screw Coupling ItemName : 4 Pack 7mm Flange Coupling Connector, Rigid Guide Steel Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Motors, High Hardness Coupling Connector-Silver. ItemPackageDimensions_Height : 15.24 centimeters ItemPackageDimensions_Length : 0.762 centimeters ItemPackageDimensions_Width : 8.89 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : set-screw-couplings Manufacturer : ANCIRS Material : Alloy Steel MeasurementSystem : English MetalType : Alloy Steel MetalType1 : Copper MetalType2 : Brass ModelNumber : AN1014 NumberOfItems : 4 NumberOfPieces : 8 OperatingVoltage : 600 volts PackageLevel : unit PartNumber : AN1014 ProductDescription : Specification: Color: Gold Material: Brass Thread Size: M3 Net Weight: 7.8g Connection Diameter: 2mm to 2mm/0.08 inch to 0.08 inch Total Size: 20 x 9mm / 0.79 inch x 0.35 inch (L*D) Package List: 8pcs brass shaft coupler 1pcs M3 Hex Wrench 32pcs screws