M3-M12 Carbon Steel Flat Threaded Rivet Nut Flange Rivnut Nutsert Fastener(M8x2

There are seven different sizes from M3 to M12 that you can choose as needed for various purposes. There are seven different sizes from M3 to M12 that you can choose as needed for various purposes. These are internally threaded and counterbored tubular rivets that can be anchored entirely from one side.

eBay