Details: * fresh and high quality.*Material: carbon steel*Color: Black*Size: M8X18mm (As picture show)*High strength and hardness.*Not smooth to rust.*Convenient to use.Package Contents:5*ScrewNote:1.The real colour of the item could also be slightly diversified from the pictures shown on web content attributable to many factors similar to brightness of your monitor and light-weight brightness.2.Please allow slight handbook dimension deviation for the data.