Details: *High strength and hardness.*Not smooth to rust.*Convenient to use.*Material: carbon steel*Color: Black
*Surface treatment: galvanized
*Size: 6mm/7mm/8mm (As picture show)*Quantity:10pcsPackage Contents:10pcs*ScrewNote:1.The real shade of the thing could also be barely diversified from the pictures proven on web content attributable to many factors comparable to brightness of your visual display unit and light-weight brightness.2.Please allow slight handbook dimension deviation for the data.