Like any lock, or split washer these will help keep nuts from backing off and bolts from coming undone. Unlike more common lock washers, these are made of a highly corrosion resistant, solid 316 Stainless Steel alloy.
I love getting top notch quality hardware in individual little envelopes with hand written contents on each one. Plus a picking sheet to cross-reference. Spectacular...I know that I am weird but I can stare at acorn nuts all day.
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