Shopping Cart

Your cart is empty.

Your cart is empty.

Holistic Drill Bit Gauge - for Larger Drill Bit Sizes - 1/4'' thru 5/8'', E thru Z, 6mm thru14mm

4.5 (1) Write Review
Free shipping on orders over $29.99

$12.50

$ 5 .99 $5.99

In Stock

About this item

  • Contains gaugung holes for 53 drill bits in three drill bit families: Fractional, Letter & Metric.
  • Fractional sizes from 1/4" thru 5/8". Letter sizes from F thru Z. Metric sizes from 6mm thru 14mm.
  • All gauging holes are in absolute size order regardless of family. This allows quick & easy comparison of drill bits between families without consulting any confusing conversion charts. Helps you to substitute a drill bit you have on-hand for one you don't. E.g. 7mm bit is equivalent to a Letter J bit. Letter Y bit is equivalent to 13/32" bit
  • No need to consult confusing size conversion charts - decimal equivalent sizes are printed on the gauge for all three drill bit families.
  • Decimal equivalent diameters and Metric (mm) equivalent diameters are shown on the gauge right below the gauging holes. Helps you find the right bit for the job at hand & compare bit sizes between families.
  • Handy Imperial & Metric rulers with notch to measure screw and bolt lengths accurately.
  • Instruction Sheet included for proper use of this tool to measure drill bit diameters.
  • Same Bonewright Brand Quality as our Model FNM92-B Holistic Drill Bit Gauge for smaller size drill bits. Made of rigid, durable military-grade fiberglass.


Same Bonewright Brand Quality as our Model FNM92-B Holistic Drill Gauge for smaller size drill bits.


Jason S. Antman
Reviewed in the United States on March 6, 2025
I've had a few different metal drill bit gauges over the years but always abandoned them in favor of calipers because the tolerances weren't tight enough to actually tell the difference between closely-sized bits. This is well made and durable, but best of all it's actually made with close enough tolerances that the holes are accurate within a thou or two. Must-have.