Details: * fresh and excessive quality.*Material: carbon steel*Color: Black*Size: M8X18mm (As photograph show)*High strength and hardness.*Not smooth to rust.*Convenient to use.Package Contents:5*ScrewNote:1.The real colour of the thing may be slightly diversified from the photographs shown on web page caused by many points reminiscent of brightness of your visual display unit and light brightness.2.Please allow slight handbook measurement deviation for the data.