Exhibit 99.1350CERT

         Certification Pursuant to Rule 30a-2(b) under the 1940 Act and
                      Section 906 of the Sarbanes Oxley Act

Pursuant to 18 U.S.C. ss. 1350, the undersigned officer of BlackRock
International Index Fund of BlackRock Index Funds, Inc. and Master International
Index Series of Quantitative Master Series LLC (the "Registrant"), hereby
certifies, to the best of his knowledge, that the Registrant's Report on Form
N-CSR for the period ended December 31, 2007, (the "Report") fully complies with
the requirements of Section 15(d) of the Securities Exchange Act of 1934, as
amended, and that the information contained in the Report fairly presents, in
all material respects, the financial condition and results of operations of the
Registrant.

Date: February 21, 2008


/s/ Donald C. Burke
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Donald C. Burke
Chief Executive Officer (principal executive officer) of
BlackRock International Index Fund of BlackRock Index Funds, Inc. and
Master International Index Series of Quantitative Master Series LLC

Pursuant to 18 U.S.C. ss. 1350, the undersigned officer of BlackRock
International Index Fund of BlackRock Index Funds, Inc. and Master International
Index Series of Quantitative Master Series LLC (the "Registrant"), hereby
certifies, to the best of his knowledge, that the Registrant's Report on Form
N-CSR for the period ended December 31, 2007, (the "Report") fully complies with
the requirements of Section 15(d) of the Securities Exchange Act of 1934, as
amended, and that the information contained in the Report fairly presents, in
all material respects, the financial condition and results of operations of the
Registrant.

Date: February 21, 2008


/s/ Neal J. Andrews
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Neal J. Andrews
Chief Financial Officer (principal financial officer) of
BlackRock International Index Fund of BlackRock Index Funds, Inc. and
Master International Index Series of Quantitative Master Series LLC

This certification is being furnished pursuant to Rule 30a-2(b) under the
Investment Company Act of 1940, as amended, and 18 U.S.C. Section 1350 and is
not being filed as part of the Form N-CSR with the Securities and Exchange
Commission.