Engineered with unique teeth set for an ultra aggressive cutting actionDesigned for rapid stock removal, extended life, and heat free sawingDesigned to cut through strapping and joists with 2 1/8 inch cutting depth.Includes:(3) TCT Hole Saws: 2 1/8 in, 2 9/16 in, 3 5/8 in(1) Arbor with Carbide Tipped Pilot Bit: A2-E(2) Carbide Tipped Pilot Bits: XA014CCase