Project KICS Special Four Prong Lug Nuts to bolt on their Project Kics 15mm spacers to your car. For use with 15mm spacers. Only 12mm tall. 12×1.50mm. Uses Special four prong key to tighten and remove. Special lugs for 10, 20 and 30mm thick Project KICS spacers also available. Also available in 12×1.25mm. Sold individually. Project Kics Four Prong Key sold separately.