A lot of peacher benches have bar rests in place, so Dumbbell Preacher Hammer Curls are not a common gym exercise, however, if you fancy a variation from the norm, give them a go.
An inverted/neutral grip of a Hammer Curl is often preferred amongst female workouts in order to hit the Brachialis muscle, rather than Biceps Brachii specific exercises. This can help avoid against the look of a "peaky" bicep.
Exercise image from Gym Professor Shuffle free gym workout app.
For further exercises, visit the Gym Professor Exercise Index library.