THIS LISTING IS FOR TWENTY FOUR (24) ThunderJet LONG Rear Axle. This axle is an exact copy of the original Aurora ThunderJet Long rear axle. The spline pattern and length exactly matches the original. They are made from 1/16" (0.0625") stock 1018 steel and extra insistance was placed on making sure they are straight. The splined areas on original Aurora axles can vary widely. The spline area on these axles can vary in diameter from .0625" to about .0635", a variation of approximately 1.6% This acle can also be used on X-Traction, Johnny Lightning, Auto World, Dash and can probably be used on TOMY Turbo, SRT and Super G+ as well. Sold as is. Buy with confidence please check out my other offbeat slot car related items. Descriptions are very accurate; No Returns. PLEASE ASK BEFORE YOU BUY IF YOU ARE UNSURE. We ship promptly professionally. We happily combine orders refund any excess s/h immediately upon shipping. We can always provide tracking. I charge $1 for expert handling/packaging, actual shipping. I ship out of the country almost daily. Please refer to my feedback, rating or time selling HO slots for assurances of a good honest deal. happy motorin' thanks S'lots from Bob. We Know H.O.