Key record setter

Whatsthestory

New Member
Turkish
Hello all,
A trucker talks about another trucker and says: "He's a wild man at the end of the year, a key record setter."
I assume that "A" means that "B" breaks the record and manages to deliver more hauls than the others.
But I don't understand why he says "key record" setter.
Does he mean something else by any chance?
Thank you.
 
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