Allen Key Size: T6,T8,T9,T10,T15,T20,T27,T30. Allen Key1.Size: T6,T8,T9,T10,T15,T20,T27,T30.2.Made of high quality S2 alloy steel.3.Hardness HRC60°±2°,Torque high 20% than Cr-V.4.Surface: Red treatment, beautiful and durable.5.Chamfer end easy to inset screw cap. Allen Key