Butler Built front axle King pin tether for 50" front axle. Remove your King pin cap and insert the included cap/stud. Put a little grease on the stud and slide the tether on and tighten the included jet nut. Slide the aluminum tab in along with the front axle tether and pin it or put the tether in the groove in the front axle clamp. Original style, works with all axle clamps.