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Yes, it is possible.
You can look at the link below for all the information that you need on the visitor visa:
Essentially, he must have a valid reason for visiting, must have a way to support himself without working illegally, must have significant ties to his home country, and must have the intent to return home.
A letter of invitation helps with some of this as it will help to show why he is coming to the U.S., how much time he will need and that perhaps he will have a place to stay so that he doesn't have to spend money. The most important part of a case is to have strong ties to the home country.
So your letter should state why you are inviting him and that you will provide room and board while he is here visiting.
Now as to some of the ties, he will need to show that he has significant close family at home, property not easily sold, and a good job for a good company that he has had for awhile that he would not normally abandon.
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