This is an optional JConcepts 4-40 x .300 Ball Stud Set. A great quality ball-stud is an underrated functioning component of a high performance R/C vehicle, and is the foundation for a solid tie-rod connection. Durability, smooth finish, thread engagement and adjustability play a significant role in the performance of your car. JConcepts is offering a precision machined, stainless steel ball-stud, that features an internal hex for installation and a smooth surface finish for ultra free movement. Packaged in quantities of six, the ball-studs are available to meet the demands for any Team Associated off-road vehicles.