EASY TO ASSEMBLE AND INSTALL - This set of PANGCH pigeon spikes come disassembled. There are 3 holes (0.315”x0.216”) per strip for mounting purposes. You can anchor with a zip tie, screws, double sided tape, construction adhesive, etc. These bird spikes can be taken down when you don’t need them or remain in place year round. WEATHER-PROOF STAINLESS CONSTRUCTION - PANGCH Bird spikes 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. Each strip is 9.84” 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”.