These Century Drill #1 Phillips insert bits are made from premium S2 shock-resistant tool steel for long life when driving common, mild steel, or case-hardened screws. S2 steel offers superior toughness and wear resistance compared to standard chrome vanadium bits.

• Premium S2 shock-resistant steel (HRC 55-60)
• #1 Phillips tip for smaller Phillips screws
• 1" standard insert bit length
• 1/4" hex shank fits power drills, cordless screwdrivers, and quick-change adapters
• Drives common and case-hardened Phillips screws
• 2-pack