The Moroso Adjusting Nuts 67120 are high-performance parts designed for auto enthusiasts looking to enhance their engine components. Designed for a stock rocker with a 3/8" stud, these hex head nuts provide adjustable tension for improved engine performance. Manufactured by reputable brand Moroso, these nuts are a reliable choice for those seeking precision and quality in their car modifications. Please read the info in the photos before purchasing . Hex head for stock rocker on 3/8" stud without set screw. The box shows prior storage from age.