IRWIN 3054001 Screwdriver Bit, #1 to 8 Drive, Phillips/Slotted Drive, 1/4 in Shank, Hex Shank, Steel

S2 tool steel construction with a Rockwell Hardness between 58 to 62 for strength and precise fit. Quick, easy change-out in production use. Hex shank of size 1/4 in. 2 per pack.