I cant even imagine pushing oil through a 25ga pin other then a 5/8's.When ever I do use those little pins with that much oil I'll pull out and hit a second spot,left right delts tris and so on.I always have 1-1/2 23's and 5/8's 25's on hand.large pins large muscles small pins small muscles.If you dont care to have multiple size pins just buy 1-1/2's you can cut the sheath of the pin with a scissor to any size and place it back on the pin as a stop.