Special Features: 7/64â Titanium steel Heel bit 135 Ì split point M2 high speed steel with NEW patented zinc 1/4â hex shank.Titanium 135° Split Point 7/64" Zinc Hex Shank Patented Steel Heel Material Type: 135 Ì Split Point M2 High Speed SteelIncludes: 7/64â Steel Heel BitsApplication: Usage for drilling into Sheet metal, Mild Steel, Drywall, and more Self centering (less walking).