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Fullerton Tool 18937 | 3/8" x 90-degree 6 Flute Solid Carbide Countersink - All Industrial Tool Supply
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55225 Carbide Tipped Countersink with Adjustable Depth Stop and No-Thrust Ball Bearing, 3/8 Dia x 3/32 Drill Dia x 1/4 Inch Quick Release Hex Shank
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