Rotor Blade Allen Key For M5 Socket-head Screws

Rotor blades for large-scale model helicopters must be secured using screws of the appropriate size. Normally M4 bolts are employed, but here the usual size is M5.

The T-handle of this M5 allen key provides plenty of torque, but you should only tighten the screws to the point where the blades can still align themselves at start-up.