uxcell 6mm 15/64" Bore Robot Motor Wheel Coupling Coupler Alloy Product Name : Motor Wheel Coupling;Bore : 6mm / 15/64"(0.236") Screw Diameter : 4mm / 5/32"(0.157");Hex Head Opposite Sides Distance : 12mm / 0.47" Bottom External Diameter : 10mm / 0.39";Overall Length : 17mm / 0.67" Material : Alloy;Color : Silver Tone Net Weight : 11g;Package Content : 1 x Motor Wheel Coupling