20/30 European Standard Aluminum Profile Rear Nut T-shaped Boat Hammer Nut for 3D Printer
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Perfect
Note that price is per T-nut (ie there is only one t-nut per pack) - which makes them pretty expensive. I mistook "20 type M4*10*6" as meaning 20 of the M4 nuts, but 20 refers to the type. Scroll down the listing and you'll see there is only one nut per pack, so my fault for not reading properly. Banggood were pretty good about it and gave me a bit of discount. As it is, I can't recommend them at this price - they'd need to be gold plated!
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Write on the product title 1 PER PACK come on banggood
"Slightly" misleading title and pricing. The price is only for 1 piece which makes it hilariously expensive. I thought there will be 20 pieces in the package. However i cant blame them, still it is obvious that their strategy is based upon exploiting buyers who are used to certain naming patterns.