If you are not using the Quad-Tel or the Tri-Tel pole and already have a 1-1/4 in OD round pole, use this adapter to adapt your 1-1/4 in OD round pole to an S & K Martin Houses (models BH12, BH14, BH16). This adapter snaps into the center of both of the floors in the S&K Martin Houses and can slide over your 1-1/4 in OD round pole or slide into your 2.125 in ID round pole.