SQUARE SCREWDRIVING BIT NO2 POWER 2in. S2 STEEL - S2 STEEL SCREWDRIVING BITS. MADE FROM PREMIUM S2 STEEL FOR LONG TOOL LIFE WHILE DRIVING COMMON OR MILD STEEL SCREWS OR CASE HARDENED SCREWS. LASTS 2X LONGER THAN STANDARD SCREWDRIVING BITS. AVAILABLE IN 1in. INSERT OF 2in. AND LONGER POWER BITS.