Does anyone have any ally or steel tube with an od of about 9-10mm, tapped to take an M6 bolt?

Looking for 4 pieces, each about 40mm long.

Thanks

Try doing a google for "stud connectors" that's how I found mine.
Try here ,they tend to be hexagonal though.
Or try McGill's M6 Right Hand Threaded Insert / Tube Adaptor,Rose Joint | eBay

[Edited on 28-7-12 by 40inches]