You are looking at a brand NEW dual thread air cleaner stud!- 5" long (can be shortened) - with 1/4"-20 and 5/16"-18 threadsThe 5/16-18" thread suits Dominator, or some air cleaner nuts with 5/16-18" thread.The 1/4"-20 will suit most Holley, Rochester, Quadrajet, Carter, Edelbrock and other carburetors.Thanks for looking and don't forget to check out all of our Restoration Essentials in our store. Your parcel will have a unique tracking number which will be sent to you via email on dispatch so you can keep an eye on your delivery.