http://www.machinemart.co.uk/product.asp?p=040219960

those are also really handy, i have a set in my tool box at work coz your gaurenteed to round a 15yr old screw off at some point

i also have stud extractors, bolt extractors as well as thread cleaners an tap and die set, all snap on

nothing beats be, ill remove ANY bolt with the gear i have