4.5 inch dia borewells are usually drilled for domestic and commercial purpose and it is usually has 5 feet length rod or pipe.
6.5 Inch Borewell Drilling - Trichy
6.5 inch borewells are drilled when higher yield is required for large apartments or buildings and also for agricultural purposes.
Borewell Flushing / Cleaning - Trichy
To remove sediments, mud from the path while flushing, the drilling which is used to give a better solution for retrieving water.