Selecting the strike/stock range allows you to determine a range of options that will be displayed. For example, if you want to write calls that are just out of the money, you can select a strike/stock range from 100% to 110%, and only the slightly out-of-the-money call options and slightly in-the-money put options will be displayed. Similarly, if you are interested in deep-in-the-money calls, you can select a strike/stock range from 50% to 80%.