uxcell 2mm x 4mm Coupler Connector Adapter for RC Airplane Boat Motor Product Name : Motor Coupler Connector;Type : 2mm to 4mm Total Size : 2.5 x 0.9cm/1" x 0.35"(L*D);Main Color : Gold Tone Material : Metal, Plastic Weight : 11g Package Content : 1 x Motor Coupler Connector,1 x L Shape Shaft,Several Mount Accessories