I make and sell a lot of the interchangeable crochet hook sets from PSI. My standard grip is usually ~.75" or a little less. I get asked about thicker grips for those who like or need them. It's mainly a comfort thing. I doubt that a heavier grip is better or worse than regular hooks. I normally make them out of hardwood. It occurred to me that cork would make a grip even more comfortable, so here we are.
~1" x 3.25" (grip only). Brown, River Cork with a Mahagonny butt cap
~1" x 3.25" (grip only). Brown, River Cork with a Mahagonny butt cap