Pillar Stone for Fencing

Dear Farmers, Wondering if any one can share contact for procuring Fencing Stone pillars. I am looking at 4X6 - 7 feet or 6X6 6 feet near to chikbalapur in Bangalore.

Also can someone help with the question - Do Stone pillars need to have concrete poured into the bottom or will them being put int he ground and covered with soil be enough.