Depth: Measure the top of your gutter from front to back. This determines the gutter depth. It should be a 5” or 6” depth.  Half Round Styles are available in 5” and 6” depths. Leaf Defier™ has the capacity to create any custom sizes and specialty shapes you need (Contact Us if you require special shapes) . Linear Feet: Measure the length of the existing gutters on your house to determine linear feet. Leaf Defier™ is available in 4' sections.