This is a very high quality brake master cylinder. This is used on the 1948-1966 jeeps. The two mounting bolt holes on this are not threaded. IMPORTANT…Please measure the distance between the bolt holes on your original!!! This one is 3 1/2″ from center to center. This is made by the same manufacturer that makes the castings for Wagner. We have been selling these and using them ourselves for years and have had really good service out of them.