Armstrong Ceilings Suprafine 20-Pack 144-in Galvanized Steel Ceiling Grid Main Beam144 in x 9 16 in x 1 11 16 in Rotary stitched web for additional torsional strength and extra stability Hot dipped galvanized coating inhibits red rusting better than electrogalvanized or painted systems Intermediate duty load performance 240 Lft per carton (20 pieces per carton) Easy to cut and field modify to suit job conditions using standard tools White colored capping SuperLock main beam clip is engineered for a strong, secure connection and
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