What kind of a socket do i use to disassemble the front brake caliper? It looks like a star shape or reverse torx? A 10 mm socket fits on it but i am unsure of rounding over the edges? Where do i go to get one of these sockets? Below find picture of caliper.

http://www.bikepics.com/pictures/2173764/
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MC21R9N track
MC18R2J track
CBR954
CR250