Contractor insurance/bond , workman comp questoin.

[Nate Mao]

I try to hire a general contractor which claimed have all required insurance and bond.

I am a little concerned do to I see the bond amount only $10,000. and his insurance is a businessowners policy and looks like he used his home as insured address.

The link to his insurance copy:
http://www.fileswap.com/dl/JZwaeMVqTi/liability.jpg.html

I also have question on what is the bond used for and the liability insurance? and how much is enough for the workman comp?