these plant hanger sets are designed to hold clay or terracotta type flower pots between 4″ to 7″ in diameter. The key to arranging your display correctly and safely is by evenly distributing the weight on all sides. 10″ extensions must be used in combination of pairs. LARGE SET IS A 24" MAIN HANGER WITH TWO 10" ENTENSIONS SMALL SET IS 12" MAIN HANGER WITH TWO 10" EXTENSIONS