Material:alloy steelSize:150mmx12mm /1/4"Features:1.High hardness， high toughness， high torque.2.Effective prevention of surface corrosion， feel more comfortable.3.Operation will not slip， increase security.Planes and angles and screw combined with surface consistent，torque force is added， so that the screw are more likely to tightenor open， reduce nut wear， increase the service life of the nut.Evenrusty screw is easily unscrewed， operation will not slip， increasesafety， particularly effective against rust or unable to open the nut.Package include:1 x The elastic soft shaft