You can now get the Fixedgearlondon Lockwhip tool in The Foot Down Shop! This is the very best tool available specifically for use with a fixed gear bike, without a shadow of a doubt.
It is made from hardened steel and has a 15mm wrench, chain whip and lockring tool. Designed and manufactured right here in the UK this thing is a work of art.
They are £26 with free UK postage and super cheap shipping to Europe and the rest of the world. Pick one up now, satisfaction guaranteed!