That is the same guy I ordered from, but I ordered a 45mm bit. You want to drill a 1 - 3/4 inch hole to fit a bulkhead that will hold a 1" pipe (a 1" bulkhead fitting). 1-3/4" is equal to a 45mm bit.
As for the other thing, I grabbed it off of the workbench at work. I think it came with a Rotozip too to convert the rotozip to a drill, but I found this on E-bay and the price is right.
http://cgi.ebay.com/VINTAGE-CRAFT-DR...QQcmdZViewItem
I guess it is a drill guide for a hand drill. I would suggest you use an electric VARIABLE SPEED drill. I was lucky enough to have a drill that allowed me to "dial" in the speed that way no matter how far I pushed the trigger the drill remained at the same speed. You want to drill at a slow speed, I think around 500 rpm.
Hope this helps!
