6" ruler w/Tap and Drill Table and Decimal reference -stainliess

• Convenient 6" rule is graduated in 64ths.
• Essential tap drill and decimal equivalents reference table for toolmakers, machinists and mechanics.
• Front has machine screw size tap drill chart for recommended 75% depth thread.
• Back has decimal equivalents table in 64ths from 1/64" to 63/64".
• For National Fine and National Coarse, American Standard Pipe and metric threads.

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