Cadmium plated steel internal tooth lock washer proved efficient locking action by spring tension and biting action of tapered twisted teeth. Made of 1050 spring steel and cadmium plated per specification QQ-P- 416A, Type II, Class 3. (Old number AN936-A) Sold in packages of 25 only.
Pilots HQ responded promptly to my order. They were delivered on time and pricing was reasonable. I would order from them again. Top notch company, very professional.