Looking to change handlebar, what do these numbers mean?

[Joe_W]

Yeah, Sheldon Brown wrote something along the lines of "in the old times we needed a torque wrench with steel components, now in the age of carbon, why do people think they can get away without using one?". There has also been an article on bolts on slowtwithc recently:
http://www.slowtwitch.com/Tech/Bolt_Tech_-_Will_Torx_Win__3170.html
found this an interesting read, especially since I actually disliked the Torx.