Specification: Material Used: Steel Plating: Zinc for rust prevention Application: are ideal for holding the diff into the English Axles. These are very easy to hold on spanner. Made of steel, these Blind Diff Nuts make changing a diff in a hurry a lot easier. Their blindness, stops dirt etc to enter onto threads, thus makes the changing job a lot easier while in hurry...! The price is for the set of 8 nuts.