Mystery part

[NROBOS]

Greetings colleagues, we have a part that we used last year to bolt our bumpers to the robot. below is a picture. If anyone could help us out with the name of this part or where we could buy one it would be greatly appreciated. We need 8 of them.
Warm Regards, Team 2220

[EricH]

Blind nut or T-nut is the common name. Try a hardware store for a source.

[NROBOS]

Thanks a lot,
Team 2220

[Daniel Krastev]

Look up "T nuts" on Mcmaster. We used these this year for our bumpers.