Classes 4810 and 4820 used in piping for naval surface ships and submarines. (ii) Machine tools in the Federal Supply Classes for metal-working machinery numbered 3405, 3408, 3410 through 3419, 3426, 3433, 3438, 3441 through 3443, 3445, 3446, 3448, 3449, 3460, and 3461. (2) Applicability to certain items Paragraph (1) does not apply to a procurement of spare or repair parts needed to support components for vessels produced or manufactured outside the United States. (3) Waiver authority The head of an executive agency may waive the limitation in paragraph (1) with respect to the procurement of an item listed in that paragraph if the head of the agency determines that any of the following apply: (A) Application of the limitation would increase the cost of the overall acquisition by more than 25 percent or cause unreasonable delays to be incurred. (B) Satisfactory quality items manufactured by a domestic entity are not available or domestic production of such items cannot be initiated without significantly delaying the project for which the item is to be acquired. (C) Application of the limitation would result in the existence of only one domestic source for the item. (D) Application of the limitation is not in the national security interests of the United States. (4) Implementation of waiver authority (A) Non-delegation of authority The head of an agency may not delegate the waiver authority under paragraph (3). (B) Publication Not later than 30 days after exercising the waiver authority under paragraph (3), the head of the agency shall publish in an easily identifiable location on the website of the agency information regarding the waiver, including a detailed justification for the waiver. (5) Annual report Not later than 180 days after the end of each fiscal year, the head of each executive agency that has used a waiver described in this section in the fiscal year shall submit to the Committee on Homeland Security and Governmental Affairs of the Senate and the Committee on Oversight and Government Reform of the