A more thorough explanation:

Definition: Avail refers to the use or advantage of something. It can also refer to the profits or proceeds from a sale of property.

Examples:

• Despite his best efforts, his hard work was of little avail in getting the promotion.
• The company donated the avails of their charity event to a local homeless shelter.

The first example illustrates how someone's hard work did not result in any benefit or advantage for them. The second example shows how the profits from a charity event were given to a good cause.