MK Morse AV02E Master Cobalt Bi-Metal Hole Saw Electricians Kit Backer, cutting edge and cap work together to provide faster, longer-lasting cutting action Positive rake teeth clear chips better for longer life and easier cutting Bi-metal design bonds M3 cutting edge to fatigue resistant backer Teeth stay sharper and make smoother cuts Includes 6 Hole Saws, 2 Arbors