Brand new, never used, open package. Homehardware won't take it back because the packaging has been opened... 🙄 Unfortunately, size 4"1/2 is not included: that's the one I needed! "This 16-piece hole saw set was manufactured with heat treated high carbon steel for an extended life. This set is suitable for drilling wood, plastics, and particle board. Includes: (12) hole saws (3/4", 7/8", 1-1/8", 1-1/4", 1-1/2", 1-3/4", 2", 2-1/2", 3", 3- 1/2", 4", 5"), 3/8" arbor with pilot bit, 1/4" arbor (for saws up to 1-1/8"), arbor plate, hex wrench and blow-moulded case"