This is a pair of Tail Rotor Shaft Assemblies for the Heli-Max AXE 400 3D. FEATURES: Metal construction INCLUDES: Two Tail Rotor Shaft Assemblies, key #54 REQUIRES: Installation on the helicopter SPECS: Length: 41.6mm (1.6") Shaft Diameter: 3.15mm (0.12") cnh 12/20/08 ir/jxs