Our 4x4 Tie rods are manufactured from 2 types of material 4140 solid bar or 20MNV6 hollow bar; this makes our 4x4 tie rods and 4x4 drag links the best on the market without a doubt. Superior Engineering's Panhard rods are manufactured from the 20MNV6 Hollow bar and we use fine thread with twin locking nuts to ensure the highest strength and quality, we also only fit genuine bushes to our 4x4 panhard rods.