NO MORE BIRDS NESTING POOPING PROBLEMS - bird spikes can prevent any type of birds from landing and sitting on window sills, in gardens, fences, on roofs and other places so they dont foul or nest in these areas. Perfect for small, mid, and large sized birds such as sparrows, barn swallows, robins, pigeons, seagulls and others. Additionally, these bird spikes work on squirrelsraccoon as well. EASY TO ASSEMBLE AND INSTALL - This set of pigeon spikes come disassembled. Simply insert the spikes in the base before putting the bird spikes where birds are perching, nesting and pooping. There are 4 holes (0.315x0.216) per strip for mounting purposes. You can anchor with a zip tie, screws, double sided tape, construction adhesive, etc. These bird spikes for small birds and large birds can be taken down when you dont need them or remain in place year round. WEATHER-PROOF STAINLESS CONSTRUCTION - spike strips for birds are made of premium 304 grade stainless steel which will not rust or weaken when exposed to the elements or leave unsightly rust stains on your property. These stainless steel bird spikes are long and well positioned to prevent birds from landing. Each strip is 13 long and 1.15 wide. The width of the spikes at the top is 2.15, the depth from the base to the top is 4. RIGID BUT CAN BE CUT OR BENT TO MAKE A BETTER FIT - The metal spines of bird spikes are quite rigid. The metal base is rigid enough to stay straight, but you can bend these stainless steel bird spikes to fit inside and outside corners or cut them to fit into shorter spaces. A hacksaw/sheet metal shears/snips/wire cutter could snip any excess off the spike strip.