Grip strength and forearm size do not always go hand in hand. Gripping exercises alone, like heavy DL's, pinching a pair of BB plates together, chinning from a beam with a pinch grip, etc, do not always produce a muscular, large forearm. Basic wrist bone size & length can influence forearm mass. A lot of somewhat skinny looking forearms can be very surprising in their power.
Most men want that impressive goose neck affect, when showing the belly of the forearm, along with forearms that look like there are steel cords udser the skin. As suggested before by some ot the other guy's, BB wrist curls can be effective, if the bar is started at the last joint of the fingers and fully contracted at the top position & very hard. Reverse wrist curls with the thumbs over the bar. Can also do any form of wrist curls with a BB, while standing. Might also consider using a cable bar hookup rather than a regular BB, at times, for wrist curling. Resistence is kepted on the curling of the wrist throughout the movement, not so much with the BB (if the arms are resting on the knees). The old fashion dowel (broom handle, etc), rope and BB plates can give good results. Holding two heavy DB's at each side and wrist curling is effective. Might try taking a full sheet of newspaper (prefered the NY or LA times) , start at a corner, and just wad it up into a toght ball. Great burn, also. God Luck.
