3871-3.0  - 6 x 3.4mm 180 Degree Counterbore Drill for M3 Screws

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3871-4.0  - 8 x 4.5mm 180 Degree Counterbore Drill for M4 Screws

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3871-5.0  - 10 x 5.5mm 180 Degree Counterbore Drill for M5 Screws

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3871-6.0  - 11 x 6.6mm 180 Degree Counterbore Drill for M6 Screws

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3871-8.0  - 15 x 9mm 180 Degree Counterbore Drill for M8 Screws

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3871-10.0  - 18 x 11mm 180 Degree Counterbore Drill for M10 Screws

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3871-12.0  - 20 x 14mm 180 Degree Counterbore Drill for M12 Screws

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