All billet spacers are drilled to allow stock wheel nuts to be countersunk into them. This ensures a flat surface for the wheel to sit againstThe outer diameter of each spacer series is different to match the OEM hubT6-6061 Aluminum BilletSold in pairsIncludes set of lock nutsThickness: 2"Bolt Pattern: 4 x 156Stud: M12x1.25mm