The loft of most 7 woods fall between 21 and 23 degrees. The loft of a 7 wood is between that of a 3 iron and a 4 iron.
A 7 wood is considered a fairway wood, and it is designed to be more forgiving than a 5 wood. The 7 wood is about an inch shorter than a 5 wood, making it easier to control and hit the sweet spot. The increased loft and more sole head-weight allows the ball to get up quicker and higher than a 5 wood. A 7 wood can be used in the fairway, in the short rough or out of a sand trap.