A person with smaller hands will find that this grip allows them to hold and manipulate their horn with MUCH less effort from their fingers.

I had my horn come loose during rehearsal the first night I used it

After only a few minutes of practicing, I would experience significant discomfort from gripping the horn and f-attachment with my left hand

Eventually the horn falls out of the clamp within minutes of taking its weight

If you play trigger horn and your left hand cramps up holding the horn, this grip is THE solution

In addition, because the left hand is better able to support the horn when using the grip, the pressure on the right hand and slide is greatly reduced