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What size hex wrench is needed for the AL400LA lug for the LA, LH, and Q4 circuit breakers?

What size allen wrench do you need for the set screw for the AL400LA lug?  

Product line:  
Molded case circuit breakers

AL400LA lug for Legacy LA/LH/Q4 circuit breakers

You use a 3/8" Allen wrench.  
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