●[Size] - 1/4-inch square drive socket, T40 torx bit, 1.5-inch (38mm) total length. ●[Durable] - Quenched and heat treated S2 alloy steel bits, high hardness, reduce wear-outs. High strength chrome vanadium steel sockets, increase turning power. ●[Torque Strength] - Complete corrosion resistance and rust resistance, mirror-polished and nickel-plated sockets and phosphate bits finish. ●[Precision Bits] - Automatically process bit tips to ensure accurate size, chamfered ends insert smoothly into fastener head, reducing wear. ●[Great Tools] - Use with ratchet to improve speed in tightening hex drive fasteners. And the product has no insulation properties and is not suitable for electrical environments.