Service tax on job work at client site

I have taken one work with material (camical tank of fiber) in maharashtra. My client have condition is you do the mfg activity at his factory. Material required for this that I have to supplied. So if I giving service to my clinet at his place so whetever bill I rasied for job work at this factory is taxable for service tax or not? 

pls help me.

mahendra