This is a replacement Female Shaft for the Pro-Spline HD Axle Kit for the E-REVO® & SUMMIT®. Do you need a replacement Female Shaft for your E-REVO® & SUMMIT® Pro-Spline HD Axle Kit? This is it! Made from Hardened Black Oxide coated Steel the Pro-Spline HD Female Shaft is designed to handle some serious power! This includes 1 replacement Female Shaft.