Service tax registration

ONE OF MY FRIEND HAS STARTED BUSINESS OF MAINTAINANCE & SERVICING OF ELEVATORS, NOW HE WANTS TO TAKE SERVICE TAX REGISTRATION. MY DOUBT WHETHER HE NEEDS TO TAKE REGISTRATION UNDER " REPAIRS AND MAINTENANCE SERVICE" OR UNDER WORK CONTRACT SERVICE, AS HE WILL BE USING SOME OTHERS GOODS REQUIRED IN EXECUTION OF ORIGINAL SERVICE.

ALSO GUIDE WHAT WILL BE THE RATE AT WHICH SERVICE TAX NEEDS TO BE PAID??