One of the pins bent when I first tried to loosen the locking nut on a DeWalt grinder. I'm not really a Hercules and I didn't use a wrench extension. I ended up using a vise to loosen the lock nut. Due to a bent pin, it can no longer be used. I used it once (installed the lock nut) before it failed. I don't normally want to leave extremely negative product reviews, but this key is too weak.
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