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A odd snap on box. Looks like 30s. size 3-5/8 in length. 5/8 deep, inside width 3/4. outside width 1-1/4. I cannot figure what it was used for. Has 4 sets on marks on the inside bottom. not deep enough for most sockets except 9/32 dr, but will only hold 4 of those. So what do you think it was for.