4-Link Kit, The Competition Engineering Standard 4 -Link is designed to offer increased adjustability over a Ladder Bar Suspension for increased performance. By locating the bars with the various mounting holes in the brackets, you can create an instant center that is correct for your application. Each kit includes four 17 1/4" directly threaded 1" O.D. x .156" wall seamlesssteel tubes with permanently mounted adjusting nuts. Also included are 3/4" Grade 8 fasteners and jam nuts. Rod ends are not included. 21" long from rod end center line to rod end center line. 17 1/4" long, 1" dia.O.D. x .156" direct threaded links, Adjusting nuts for quick tuning, 3/16" thick mounting brackets stamped from cold rolled steel, welding required