Bird-B-Gone Bird Repelling Spikes (MM2000-5/6) are 5 inches in width and 4.5 inches in height, designed to deter birds from landing or building nests. Easily attached with screws or glue, they are the ideal solution to avian perching and nesting on ledges, parapets, and roof peaks. Non-harmful to birds and people.  Covers six linear feet.