These GutterBrush sizes are designed to protect unique / specialty gutters

4" Small- 4 Inch K-Style Gutters, Mobile Home Gutters, Carports, Sun Rooms, Wood Gutters, Small Specialty Gutters (Brush diameter = 3.25 inches)

7" Commercial - 7 Inch K-Style Gutters, Large Commercial Gutters, Metal Building Gutters, Super Gutters / Pool Cages, Church Gutters (Brush diameter = 6.5 inches)

8" Industrial- Largest Industrial Gutter Systems, School Gutters, Box Gutters, Commercial Gutters, Industrial Gutters, Metal Building Gutters, Custom Gutters, (Brush diameter = 8.0 inches)