Sinker grips

Does anyone know the grip for a sinker, or is it just the two seam grip? I am trying to find a way to get more ground ball outs.

i think it good

http://www.thecompletepitcher.com/how_to_throw_sinker.htm

yes you throw it like a two seamer but on the horshoe seams. and u pronate ur arm the opposite way. put pressure on middle