MK Morse MHSA80/TA80 Bi-Metal Hole Saw, 5"Variable pitch,4 6 pitch, positive rake teeth reduce vibration and clear chips to improve cutting speed; attached pass through shank arbor is convenient and time saving; requires 4 5 16" pilot drill. Used in applications such as cutting holes in wood, plastic or any machinable metal including nail embedded wood, plywood, pipe and stainless steel.. Highlights: Type: Bi Metal Arbor Attached Dia. : 5" Positive rake teeth for more aggressive cutting