This ball joint is most commonly used for (but not limited to) the front A-arms on 50cc to 300cc ATVs, primarily 110cc, 125cc, 150cc and 250cc ATVs. Threaded Post approximately 13mm (approximate maximum outer thread diameter is 13.85mm and approximate minimum inside thread diameter is 12.4) with an 8cm total length. The core cylinder unit is approximately 32mm in diameter (excluding the lip).