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Robertson Square Drill Bit Set (10 Pack - 2.3" Long Magnetic Heads) Square Screwdriver Bit Sizes: #0, 1, 2, 3, and #4 (2 of Each Size) - - Amazon.com
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DEWALT Tough Grip 2-in #2 Square/Robertson Screwdriver Bit (2-Piece) in the Screwdriver Bits department at Lowes.com
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