MECCANIXITY 4pcs 8mm Flange Coupling Connector, Shaft Axis Fittings for DIY RC Model Motors, with 8pcs Fastening Screw 2pcs M2 Hex Wrench

What is this?Flange Coupling Connector is widely used in model shaft connection and is a great accessory for RC model motors.What will I get? Product Name: Flange Shaft CouplingInner Diameter: 8mm/0.31 inchTotal Height: 13mm/0.51 inchCylinder Outer Diameter: 16mm/0.62 inchBase Plate Diameter: 32mm/1.25 inchDiagonal Screw Hole Distance: 24mm/0.94 inchBase Plate Hole Diameter: 4mm/0.16 inchMaterial: Iron PlatingColor: Silver TonePackage Content:4pcs x Rigid Flange Coupling2pcs x 2mm Mini Hex Wrench8pcs x M4 Fastening ScrewAre there any advantages of this product?Hardened by heat treatment and then electroplated. Durable and insulation, make your shaft more stable, easy to install and replace.How to use it?Flange Shaft Coupling can fix a shaft to a plane, and can easily install other accessories on the shaft. It is easy to install and replace.What should I notice?All size is measured manually, please allow +/-0.1 inches error.