This product is a set of 6 Bosch Platinum HR6DP spark plugs designed for various car brands such as Aston Martin, Audi, DeLorean, and Cadillac. Made in Germany, these spark plugs have a thread diameter of 14 mm and a voltage of 12 V. They are standard configuration spark plugs made of platinum material, suitable for gasoline fuel type vehicles. The spark plugs are performance parts with an installation depth of 17.5 mm and are interchangeable with various part numbers such as Q6RTC and RS9YC. Please note the California Prop 65 Warning for cancer and reproductive harm. Exact item set is shown. New old stock with original packaging. Gap: 0.7 mm · Thread diameter: M 14x1.25 · Thread reach: 17.5mm · Hex size: 16. Set weight 10 oz. Made in Germany. No returns on installed items or partial sets. Please review our business policies in our store for information regarding returns, shipping and warranties.