Project KICS Special Four Prong Key to lock down the 10mm, 11mm and 15mm thick Project Kics Wide Thread Wheel Spacer Special Lug Nuts. For use with the 12×1.25mm or 12×1.50mm special lug nuts. The Project Kics Key prongs are 4mm in diameter. They are spaced 18mm diagonally across, from center hole to center hole. The Project Kics four prong lugs are 24mm in diameter. Priced and sold individually. Special 10mm, 11mm and 15mm four prong lug nuts sold separately. Please confirm the measurements with your lugs.