As you have asked about the State bank of India DFHI, I am giving you information about it, check below for the details

SBI DFHI is a Primary Dealer
It is an institution created by RBI to support the book building process in Primary Auctions of Government securities and provide necessary depth and liquidity to the Secondary market in Government Securities.

It offers following products and services:

Govt Securities
State Development Loans
Treasury bills
Money Market Instruments
Corporate Bonds
Mutual Fund Products

Contact:
SBI DFHI Ltd
Voltas House (3rd Floor),
23, J. N. Heredia Marg,
Ballard Estate,
Mumbai – 400 001
022 33864600 / 022 22625970
022 22610483 / 022 22625968