Deep Hole Blind Nut? Didn't see that coming.
Those nut savants at Chuanghe Fastener Co care of Alibaba.com have DONE. IT. AGAIN! This week's mechanical fastener is none other than the "The Deep Hole Blind Nut" Catch me if you can little gray squirrel! Ha, Ha! Real quote: "Outer sueface Knurled, to make sure not move; welcome contact with us"
oh and Chuanghe, nice nuts!