5PCS Hexagonal hexagon Coupling Coupler Six edge 5MM Shaft Motor Flexible 30MM*FD329X5 Product Description 5 MM Shaft Motor Flexible Coupling Coupler for Wheel tyre DC Motor Robot Features Material: Brass Total length: 30mm Hexagonal edge to edge distance: 12mm Screw hole diameter: 3mm NOTE This listing including 5PCS of Coupler and 2PCS spanners ONLY Package 5PCSX Coupling Coupler(5mm) 10PCSX Screws 2PCSX Spanner