Host of the nationally syndicated and most popular home improvement radio show "At Home With Gary Sullivan", Gary has expressed the advantages and value of GutterBrush for years; he has it at his house! See below for sizes with the most common being Standard GutterBrush for 5" Gutters. Visit "Fit My Gutter" for help. For uncommon gutters or just to be certain, Sizing samples come w/ 3 sizes in each box. Listen to Gary's experienced home repair tips on iHeart Radio.