Slip FitUSFlagstore's Solid Brass Acorns are not fitted with Ferrules, but feature a slip fit for the top of poles 3/4" or 1" in diameter. The mirror finish on the flagpole ornament will make the pole it decorates stand out. Our Solid Brass Acorns have these quality features: Made from solid brass with a mirror finish No ferrule - slip fit for 3/4" or 1" diameter poles 2" height by 1-1/2" width