Specification Brand : Yuecoom BulletPoint : Bore: 1/2" Outer Diameter: 1" Width: 1-1/2" Screw: 1/4-28" BulletPoint1 : [High-quality Materials] Flange 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 : [Function] A special coupler, which can fix one shaft to a plane and install other parts on the shaft easily. Double connection points fasten the coupler tightly. BulletPoint3 : [Standard Manufacturing] Flange coupler is produced based on International Flange Standard, widely used in model shaft connection, perfect accessories for RC Model motor. BulletPoint4 : [Easy to Install] The coupler allows to mount other accessories on the shaft easily, and this type of coupling is mostly used to couple electric motors. BulletPoint5 : [Note] Please confirm the product model before purchasing. If you have any questions during purchase or use, please feel free to contact us. Color : popular ConnectorType : Coupling ExteriorFinish : Black Oxide FinishType : Finish GradeRating : Commercial IncludedComponents : No ItemName : Flange Coupler, 2pcs M4 Rigid Flange Coupling Motor Shaft Coupler Connector ID 12mm OD 18mm ItemPackageDimensions_Height : 2 centimeters ItemPackageDimensions_Length : 7 centimeters ItemPackageDimensions_Width : 5 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : set-screw-couplings Manufacturer : Yuecoom Material : Alloy Steel Material1 : Iron Material2 : Steel MetalType1 : Alloy Steel MetalType2 : Iron ModelNumber : ZAWELIYOiduogz6vxy NumberOfItems : 1 NumberOfPieces : 2 PartNumber : Yuecoomnxg645igev ProductDescription : Specification: Material: Electroplated iron Inner diameter: 12mm / 0.47in Outer diameter: 18mm / 0.71in 4 holes: 4mm / 0.16in Weight: 55g / 1.9oz (approx.)