V Band Clamp Universal 2.5" Inch Exhaust Pipe Clamp 63mm V-band Clamp Turbo Downpipe Stainless Female Male Flange

Terrible quality, sent back for a refund. V bands work by providing a perfectly flat surface to create a tight seal. These came with tiny pits in the metal as can be seen in the pictures so I don't trust they will seal, also came with some surface rust when it is suppose to be stainless steel.

Does the job it was intended for and easy to weld it to the pipe

Absolutely howling quality as expected from china’s worst parts, odd sized and not a smidge of stainless about it