The hollow design at the bottom of the prongs makes it more stable and wind resistant when inserted into the soil. Compared to other similar hooks in the market, our heavy duty shepherd hooks have upgraded with 4 extra long and double-forked base prongs, and can be disassembled and adjusted at will, means the firmness and Versatility are much better than 2 or 3 prongs, standing firmly in the ground without easily falling down.