High speed, heat resistant Carbide Steel teeth welded to a durable alloy backing and capExceptionally strong, safe, and shatter resistant.Includes:(6) Holesaws: 3/4 in, 7/8 in, 1 1/8 in, 1 1/2 in, 1 3/4 in, 2 1/4 inA1E Extended Length ArborA2E Extended Length Quick Hitch ArborA12 Arbor AdapterA014CE Extra Length HSS Pilot Drill