Details: * fresh and high quality.*Material: carbon steel*Color: Black*Size: M8X18mm (As picture show)*High strength and hardness.*Not clean to rust.*Convenient to use.Package Contents:5*ScrewNote:1.The genuine colour of the thing may be slightly diverse from the photographs proven on website caused by many points equivalent to brightness of your video display and light brightness.2.Please enable slight guide measurement deviation for the data.