what is need to take off caliper bolts i forgot what size wrench or bit it is? also non - metallic brake pads or metallic pads which is the best?

 

I picked up a set of EBC green pads for the front of my truck. Made in England but would rather get them from the Brits than the Chinese. I can't help on the bolt though, can't remember, maybe allen head? Size, pretty big! Sorry, can't help you there brother.