These ARP black oxide carb stud kits are top quality. They work great with Holley 4150 carbs. Length is 1-3/4" long. The special "bullet nose" studs make it super easy to start the nuts, especially in tight spaces. Includes studs, nuts and washers. Made from 200,000 PSI forged aerospace alloy, these were originally developed for NASCAR winston cup competition. The bolts are fully heat treated prior to thread rolling and machining. A small detail that is often forgotten. Make sure these details are taken care of, and it'll be one less thing to hold up your build. We also carry other carburetor essentials such as gaskets, return spring kits, fuel lines, etc.