Both models are approximately 15 inches long. They can remove larger fishhooks, but it is not recommended to remove fishhooks with a shank diameter larger than 1/8 or 0.125 inch for the offshore and 0.08 inch for the inshore.
The inshore GripFlip is better suited for lures especially if the lure has multiple treble hooks. The inshore has a smaller J-shaped end which makes it easier to maneuver. The offshore is harder to maneuvered but easier to position because it has a larger J and it hooks back more.