Genuine Nutrifaster N450 Blade Nut. Also compatible with Nutrifaster N350.
For best results: Make sure the motor shaft is dry, and hand tighten the blade nut on the motor shaft. Hold the screen basket and use the Nutrifaster Wrench to tighten the blade nut an additional ¼ turn clockwise, securing the blade and basket assembly. Do not store the blade nut on a wet motor shaft over night.