Ruler - 6" ruler w/Tap and Drill Table and Decimal reference - stainless
- 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.