This is the replacement for the often used 14 Bolt Axle. This spindle should be used to replace bent spindles, spindles where the threads have been damaged beyond repair, or converting another axle (or new custom housing) to use the ever inexpensive but very strong 14 bolt 35 spline hubs....What makes these special is the material used, we use 4140 Chromoly steel and then we both Heat & Cryo treat them. Those 2 combined actions yeild the strongest spindles possible. Sold by the pair.