Service Tax Rates & Heads

Dear All

I will be happy if you are clarifying my doubts

1) What are the existing rates prevailing in service tax

2) Give me the rate of service tax for the A/c Head Nos

a)00440233 - 
ERECTION,COMMISSIONING AND INSTALLATION - 10.3%

b)00440410

WORKS CONTRACT SERVICES . 4.12% ( composition)/ 10.3% normal

c)00440245

MAINTENANCE OR REPAIR SERVICE 10.3%

I will be happy if you are giving a detailed answer or any circular/notification nos to refer the same