Irwin Impact Power Bit *Material: Steel *Drill Bit Diameter: #1 Phillips *Dril Bit Length: 1 in. *Product Type: Impact Ready Drill Bit *Number of Pieces: 2 pc. *Shank Diameter: 1/4 in. *Packaging Type: Carded *Forged bit for superior fitment. Manufactured with heavy duty, cold-forged, high grade steel. Black oxide finish.