Fortunately, most hail is small - usually less than 2 inches in diameter
The largest hailstone ever recorded fell in Coffeyville, Kansas on September 3, 1970. It measured about 17.5 inches in circumference (over 5.6 inches in diameter) and weighed more than 26 ounces (almost 2 pounds)!
Hailstones can begin to melt and then re-freeze together - forming large and very irregularly shaped hail