Freakin cool

[TK]

[video=youtube;5JbnDXw-0pM]http://www.youtube.com/watch?v=5JbnDXw-0pM[/video]

 

[Denis Gionet]

Neat, but wtf are they ?

I saw on TV one time, how they "stick" the fittings on camper holding and water tanks.... a bigass drill spins the fitting at high speed against the tank, and it welds itself to the tank from the heat. Same principle as in the video above.

 

[TK]

I think they're wheels of some sort, but they look pretty heavy duty for that.