DetailsHeavy duty swivel leveling feet for your frame jig. Includes two clamps, four leveling mounts, and hardware. Each mount is zinc plated with a 3" stud, jam nut, and non-skid pad. They swivel 15 degrees in all directions. You'll need 40 to 48 inches of 2"x2" or 2"x3" tubing to make the feet for your jig. Requires drilling six holes and welding nuts (included) to the tubing. Made in the USA.