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 1 INCH INSERT OF 2 INCH AND LONGER POWER BITS. SET INCLUDES: INSET BITS (1) #1 PHILLIPS, (5) #2 PHILLIPS (1) #3 PHILLIPS, (1) #1 SQUARE, (3) #2 SQUARE, (2) #3 SQUARE, (1) #8-10 SLOTTED, AND (1/EA) 1/4 INCH , 5/16 INCH , 3/8 INCH NUTSETTERS. 2 INCH POWER BITS (2) #2 PHILLIPS, (1) #2 SQUARE, AND (1) #8-10 SLOTTED. 4 INCH POWER BITS (1) #2 PHILLIPS AND (1) #2 SQUARE. (1) 3 INCH COMPACT MAGNETIC SCREW GUIDE.