I have a set of the blue fat gripz. They are a good tool for training forearms and grip with anything that has a bar. Curls, dead lift, OHP, etc. I use them on everything. Really enhances the strain on your grip and forearms to keep ahold of them. Also use them on the squat rack when doing toes to bar, knees to chest or pull ups (my gym has no dedicated pull up bar).
Pricey for what they are, but integrating them into your workouts will give you some good results.
