The kit contains a cook box scraper and spider screen brush, which are essential in order to give your barbecue that proper deep clean. The Cookbox Scraper has been expertly designed by Weber to remove any fat and grease residue built up within the barbecues cook box, with its flexibility it easily allows cleaning in all of your cook box, and the spider screen brush allows you to clean the spider screens which is otherwise hard to clean gently. In the instructions, you can see where the spider screens are located on your barbecue and how to reach and clean them.