Customers love GutterBrush for their metal building (steel building) gutters because installation is so fast & easy , it keeps gutters from clogging, and it keeps in ground storm drainage clear too! People with these types of gutters are very limited because other gutter guard products are not appropriate for these gutter configurations, do not fit, and require labor intensive work in order to customize the gutter guard to fit continuously. Most metal buildings have gutters which the front edge is much higher than the back edge and also higher than even the roof drip edge; they are built this way for aesthetics, so that when looking from the ground you do not see the ribs of the roof. For gutter strength they typically strap or hang the outer front edge of the metal building gutter to the upper portion of the roof panel ribs, therefore, the market has many varying/different gutter profiles and measurements depending on the slope of the roof. The building is actually more aesthetically pleasing with the high gutter edge hiding the roof drip edge. Unfortunately, when such a gutter clogs and fills up with water, often the gutter is at risk of leaking back into the building because the rear edge is lower, therefore the natural path of least resistance is for rain water to leak back into the building . Customers rely on GutterBrush because they desperately need a system to keep the gutter from clogging so they can avoid these leakage problems. To continue to forever avoid gutter clogs, at some point, Gutterbrush can be easily renewed because there are no fasteners; simply remove the brushes, bang the debris out, clean the gutter and re-install GutterBrush completely renewed.