I believe the bit of kit you're after is called a pin spanner.
EDIT: Sheldon's got a page here that might help: http://www.sheldonbrown.com/tooltips/bbcups.html
@redbikesgofaster started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
I believe the bit of kit you're after is called a pin spanner.
EDIT: Sheldon's got a page here that might help: http://www.sheldonbrown.com/tooltips/bbcups.html