A very nice training grip. For right handed golfers. It places the hands in the perfect position every time. Especially nice for beginners (no, it's not USGA "legal") or for putting on a separate "training" club to swing before your round.
If you don't want to put one on a club, just put one by itself in your golf bag to remind yourself what a correct grip feels like before your round. A great swing starts with a good grip!