The GEARWRENCH 44-Piece 3/8 Drive Impact Socket set is for the professional who needs heavy-duty sockets for their demanding work environment. We engineered these sockets with innovations for ease of use and durable strength, including a Chrome Molybdenum Alloy Steel construction, off-corner loading technology to reduce fastener rounding, chamfered openings to guide the sockets onto fasteners, and deep profiles to reach fasteners in low-access areas. We build our sockets with proven strength, for the automotive or industrial technician, aircraft mechanic, construction worker, technician, or other trades worker who wants tools that work as hard as they do. Chrome molybdenum alloy steel Cr-Mo for exceptional strength and durability. Off-corner loading design reduces fastener rounding. Black oxide finish to resist corrosion. High-visibility laser-etched markings provide quick size identification. Secondary hard stamped size markings.