Specification Brand : daier BulletPoint1 : Durable Material: The coupling connector is made of aluminium alloy,it is lightweight and has an anodised silver finish on the surface, striking shaft more stable and easy for installment and replacement. BulletPoint2 : Size:Inner Diameter: 16mm/0.63 inch, Cylinder Outer Diameter:24mm/0.94inch, Cylinder Height:13mm/0.51inch,Base Height:4.5mm/0.177inch,Total Height:17.5mm/0.68inch,Mounting Hole Distance: 37mm/1.45inch,Base Diameter:50mm/1.96inch. BulletPoint3 : Widely use: Used in model shaft connection, perfect accessories for RC Model motor. BulletPoint4 : Function: Flange Shaft Coupling, suitable for model shaft connection, perfect accessories for RC Model motor, etc. 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. BulletPoint5 : Package included:2Pcs 16mm Flange Shaft Coupling + 1Pcs M5 Mini Hex Wrench + 4 x M5 Fastening Screw. Color : Black DriveSystem : External Hex ExteriorFinish : Aluminum FinishType : silver ItemName : 2Pcs 16mm Aluminium Alloy Flange Coupling Connector, Rigid Guide Model Coupler Accessory, Shaft Axis Fittings for DIY RC Model Motors ItemPackageDimensions_Height : 14.2 centimeters ItemPackageDimensions_Length : 2.2 centimeters ItemPackageDimensions_Width : 10 centimeters ItemPackageQuantity : 2 ItemTypeKeyword : set-screw-couplings Manufacturer : daier Material : Aluminum MeasurementSystem1 : Metric MeasurementSystem2 : Inch MetalType : Aluminum MetalType1 : Copper MetalType2 : Brass ModelNumber : T857 NumberOfItems : 2 NumberOfPieces : 2 PartNumber : T857 ProductDescription : Robot Replacement 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 CNC Machine Flange Shaft Coupling, suitable for model shaft connection, perfect accessories for RC Model motor, etc. Parts for RC Airplane Boat ,DIY Model. Perfect accessories for RC Model motor, etc.