These 2.50 spindle snouts are CNC machined in-house from aircraft quality 4130 chromoly. Starting with a billet 4130 bar we machine them to rough dimensions of the final part. We then have them heat-treated for increased strength and surface hardness and stress relieved by a leading aerospace facility. After heat-treatment we then machine and thread the critical dimensions and bearing surfaces to 0.001" tolerances. These are also what we use in our complete rear ends that utilize our 2.50 hubs. These are complete and include the locking nut and hardware. We offer these in both right hand and left hand thread versions so order one of each when needing a set. Also select the correct tubing size of the axle housing you're using them in. For Camburg 2.50 rear hubs.