2 Pcs 4mm to 3mm Dia Rotatable Universal Joint Fittings for RC Models Product Name : Universal Joint;Type : 4mm to 3mm Side Thread Diameter : 3mm/ 0.12";Ovall Size : 2.3 x 0.9cm/0.9" x 0.35"(L*D) Material : Metal;Color : Silver Tone Net Weight : 17g Package Content : 2 x Universal Joint