100PCS 6MM Shaft Motor Flexible Coupling Coupler for Wheel tyre DC Motor Robot +100 spanners *FD252X100 Product Description 6MM Shaft Motor Flexible Coupling Coupler for Wheel tyre DC Motor Robot Features Material: Brass Total length: 18mm Hexagonal edge to edge distance: 12mm Screw gap diameter: 4mm Package 100PCSX Coupling Coupler(6MM) 200PCSX screw 100PCSX spanner