The CPW Hybrid gripper solves a common complaint that thin-handled grippers place too much pressure in the palm or fingers. The standard handle provides comfort for the palm or fingers while the 16 mm handle allows you to train beyond the normal range. This gripper can be held either way as needed. It's the best of both worlds.
(16 mm is slightly more than 5/8". 20 mm is slightly more than 3/4".)