Features * Bits made of premium S2 chrome vanadium steel for superior hardness and great rust resistant. * Chrome vanadium steel socket for high strength and superior torque. * Notched drive ends fit any 1/2-inch drive ratchet or extension, preventing them from falling off. * Its chamfered end easily slides into fasteners, reducing wear. * Wide application in DIY hand-making, automotive repairs, household maintenance, and most general repairs.