A wind/hail deductible is only required in certain areas in certain states. In Ohio, for example, there's no location anywhere in the state that has a minimum amount of wind/hail coverage required. Go, Buckeyes!
A wind/hail deductible is common for people who live in areas that experience frequent severe weather, like Tornado Alley. A wind/hail deductible is higher than the general deductible amount. The benefit of this deductible is a decrease in your overall premium, but how much of a decrease is dependent on a variety of factors specific to you.
Worth noting: Wind/hail deductible is separate from a typical "all other peril" deductible – you'll only be required to pay it in the event of loss caused by a wind or hail storm.