Hard Chrome Plating: Provides improved feel, appearance, and enhanced rust resistance. Alloy Steel Construction: Special alloy steel ensures better wear resistance and higher torque strength. Advanced Heat Treatment: Balanced hardness and flexibility for high torque, processed with state-of-the-art techniques. Set contains:High Grade L Long Hex. key Wrench HLD150-1.5, 2, 2.5, 3, 4, 5, 6, 8, 10