Carbon Alloy Hole Saws are made from hardened tempered Carbon Alloy steel. Economically cut large holes in wood, drywall and light construction materials. Cuts to a depth of 3/4-Inch. Cut from both sides for deeper cuts. 4 Piece Set includes easy guide template, 1-Inch, 2-1/8-Inch Carbon Alloy hole saws and complete arbor.