introduction letter for a new mechanical construction

Hello this is MUSTHAFA, the proprietor of Mechanical Construction Company.we are dealing with fabrication and erection of steel structurals and pipeline,storage tanks and heavy equipment handling contracting company.thing is that everywhere i am approaching for the work the company's are asking for a introduction letter.so i need a good,stylish yet simple introduction letter format for our company ie Mechanical Construction Company describing the above mentioned activities.