Superior Quality & Durability: The socket set is crafted from high-grade chrome vanadium steel for enhanced strength and durability. With a hardness above 60HRC, the heat-treated sockets offer exceptional wear resistance and can handle extreme torque changes. The phosphate-coated surface ensures excellent corrosion resistance, effectively preventing rust. Easy-to-Read Dual Markings: Each socket features laser-etched markings in two locations for quick size identification, even in dimly lit environments. Save time and effort searching for the right socket size. 6-Point Design & Retention Hole: The 6-point design ensures a perfect fit between the socket and bolt, minimizing wear and prolonging the bolt's lifespan.