Part:6056
From Brickipedia, the LEGO Wiki
Revision as of 10:38, 13 December 2009 by wikia>LcawteBot (Robot: Cosmetic changes)
The Tall 2X2 Groove Brick is an uncommon brick that has a cut in slit on the side. This could be used for cables or garage doors. They have only appeared in Fright Knights with a grey or black colour.