A palm sized, 3.5" wrench, manufactured by The Light Source, with openings for all the common bolts and hardware on conventional lighting instruments. In an ideal world, the Mega Combo is all one needs to hang and focus a rig of conventional instruments, as its short length prevents over-torquing of the bolts.
http://www.thelightsource.com/products/9/view
http://www.thelightsource.com/products/9/view