1.Premium Screwdriver Bits – Made of engineered steel with forged and heat treated for greater impact resistance and a longer service life. 2.Durable – Industrial grade S2 alloy steel bits with hardened to provide improved durability and reduced breakage, black oxide finish for corrosion resistance. 3.Smoothly – Precision milled profile and optimized tip for optimum fit results and avoid skidding during screwing，Ideal for continuous high torque use. 4.Compatible – Standard 1/4 inch hex shank compatible with most drills, electric screwdrivers, ratchet wrench.
