Spyder's TCT hole saws cut more materials, faster, and last longer than conventional bi-metal saws. 6-1/4-in depth of cut. Excellent for stacked materials, deep cuts or for drilling through brick and concrete block. Note: Spyder TCT Deep Cut hole saws use Hex11 arbors/pilots which do not feature Rapid Core Eject technology; they cannot cut at an angle or enlarge existing holes.