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Wire binding screw for lug kit AL175JD. What is the larger wire binding screw for in AL250JD, for smaller wire range of 4 - 4/0 Al or Cu?

Issue:
Wire binding screw (WBS) for lug kit AL175JD.  What is the larger wire binding screw for in AL250JD, for smaller wire range of 4 - 4/0 Al or Cu?

Product Line:
Powerpact J frame

Environment:
AL175JD
AL250JD

Cause:
Digest 176 page 7-23 says in a note for the J frame breaker:  "AL250JD wire range is 3/0 AWG–350 kcmil Al or Cu. For smaller wire range (4–4/0 AWG Al or Cu), replace the lug’s wire binding screws with the larger binding screws provided."

Resolution:
S1A59551 is the part number for the WBS for lug kit AL175JD it is a set of 3 for a set of 6 use S1A59552.   And this is also the part number for the WBS mentioned in the digest note above which installs in AL250JD lug to acheive smaller wire range of 4-4/0 Al or Cu.
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