Armstrong part number question

[verbalkint99]

So I have been posting on here for less than two weeks and have found that you guys are great at helping me spend my money.

So I am piecing together an Armstrong impact socket set and have noticed that in some instances two identical sockets will have the same part number aside from one having the letter "A" after it.

Does anyone know what the differences are?

 

[Karl_B]

It looks like they throw an 'A' after a part number to indicate pack quantities. All the numbers I see ending in 'A' say you have to order five or so at a time.