1Made of high-quality CRV, higher hardness, HRC52-54 hardness. 2T-Handle,it closely connected with the connecting rod, not easy to fall off, which has 30% increase of torsion strength. 3The handle is made of PP plastic, which makes it more comfortable to hold. 4Products can twist stubborn screws faster and work more efficiently. 5Scope of application: automotive machinery, electrical appliances, cleaning equipment, computer maintenance.