The BlueSpot 16 Piece 19mm - 127mm Hole Saw Set is ideal for non-ferrous metals, plasterboard, plastic and wood. Manufactured from heat-treated carbon steel for increased durability and cutting power. Includes handy carrying case for quick and convenient storage. Includes hex key and arbors.. Ideal for non-ferrous metals, plasterboard, plastic and wood. Manufactured from heat treated carbon steel for increased durability and cutting power. Includes handy carrying case for quick and convenient storage. . .