uxcell 3.17mm to 5mm Inner Dia RC Boat Ship Model Motor Coupler Connector Product Name : Motor Coupler Connector;Type : 3.17mm to 5mm Total Size : 2.5 x 0.9cm/1" x 0.35"(L*D);Main Color : Gold Tone Material : Metal, Plastic Weight : 10g Package Content : 1 x Motor Coupler Connector,Seveal Mount Accessories