Titanium Tubular King Pin .812" & 1cap. For an overall length of 4.560". Mettec's titanium king pins are 40 grams lighter than our nearest steel competitor. Our king pins are heat treated so that they have a higher shear strength for a longer lasting and safer king pin. Each king pin has a hex on one end to make for an easier installation. They also some with an aluminum screw in cap.