12" BUTTERFLY DAMPER FOR #24 DIFFUSER GOLDEN SAND, ALL-STEEL CONSTRUCTION, USED WITH #24 CEILING DIFFUSER, KNOB CONTROL FOR QUICK ADJUSTMENT(REMOVABLE), INSTALLATION FLANGE INCLUDED, DUCT SIZE:12", DIMS:1 1/2"H X 12"W X 12"L, WEIGHT:2 LBS 2 OZ, BULK, MADE IN MEXICO.