Model No. CB370. Heavy-duty cast aluminum. Installs 1-1/4" cornerbead without nails. 1 strike from rubber mallet crimps each side of head. Heavy-duty blades bite into the cornerbead metal and drywall for a perfect corner. No. 16433: Material: Aluminum, Cornerbead Thickness: 1-1/4", Pkg Qty: 1, Package Type: Box