item 46813 sae allen key set 1.99 at sears outlet. the largest hex key seems to have a burr on the long end. not sure how they are made, looks to me manufacturing defect. all of them were like this. you could cut it or just file the end. it looks completely usable as is, just not a clean cut on the bottom. some must have been really bad, missing the large key, were marked down to 1.00
http://www.sears.com/craftsman-11pc-ni-caddy-sht-sae/p-00946813000P?prdNo=1&blockNo=1&blockType=G1
http://www.sears.com/craftsman-11pc-ni-caddy-sht-sae/p-00946813000P?prdNo=1&blockNo=1&blockType=G1