Tools · Locking Pliers (Vise-Grips)
Why do some locking pliers go dull or 'lose their bite' after a few years?
Reviewer consensus
r/Tools threads on Irwin GrooveLock and current-production Vise-Grips repeatedly mention jaw teeth wearing down faster than vintage pairs, which reviewers attribute to changes in heat treatment after manufacturing moved overseas. Higher-end options from Knipex, Klein, and the original USA-made Vise-Grips tend to hold their teeth longer according to specialist-community consensus.