What tool is required to replace the glow plugs?

Tool name and size socket etc?

I have baught the plugs, took the wiring off the plugs, and tried to use the glow plug spanner for the plugs but it does not work as its too long German and Swedish sold me the wrong tool. (Cant be bothered going back as it will cost more in fuel to get a refund)

Im assuming its some sort of socket? I intend to do a DIY job.

Is there any precautions to take whilst removing them?

Thanks in advance for the advice..

Edited 18 February, 201016 yr by REDFABVRS

10mm long reach socket little tough to undo and make sure that you tighten them to 15nm with a tork wrench dont over tighten them hope that helps