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5/16" x 18, National Course, Self Aligning Tap & Drill Set, Performance Threading System Self Aligns Tap In Pre DrilledHole Especially In Irregular Surfaces Or Through Holes, Carbon Steel, Ideal For Routine Maintenance, Repair Work & For Rethreading, Straight Flutes Are Ground To Provide Rapid Chip Removal For Efficient Threading, Designed For Hand-Threading Work In A Variety Of Materials, Includes Letter F Drill Bit