Often than not various tools are used to adjust turn buckles and ball joints, such as pliers spanners or cutters (guilty of this myself). They come in 5 different colours blue, dark blue, red, sliver and black.
Active Hobby have introduced these funky looking aluminium ball joint tools, to get you that little extra grip for putting on ball joints.
AC441B Rod End Driver (Blue)
AC441DB Rod End Driver (Dark Blue)
AC441R Rod End Driver (Red)
AC441S Rod End Driver (Silver)
AC441BL Rod End Driver (Black)
Link: Active Hobby