Drill gauge.
What is a drill gauge?
A drill gauge is a tool used for identifying drill bits sizes. Made of heat treated heavy gage steel, machined and ground to tolerance. Hole sizes and decimal equivalents are permanently etched on the face.
How to use a drill gauge?
https://youtu.be/EhR0R5nVxEY
Bibliography.
https://www.google.com/url?sa=i&source=images&cd=&cad=rja&uact=8&ved=2ahUKEwi03YCLovvhAhVBAHIKHbO5ACkQjhx6BAgBEAM&url=https%3A%2F%2Ftimeconnectioninc.com%2Fgauges%2F1658-wire-drill-gauge.html&psig=AOvVaw2iw-O__L2aj2PJetvnVnNB&ust=1556832211460958
https://www.google.com/url?sa=i&source=images&cd=&ved=2ahUKEwi7sc29pPvhAhUXVH0KHe2gBVMQjRx6BAgBEAU&url=https%3A%2F%2Fhomerepairgeek.com%2Fdefine%2Fdrill-bit-sizes.html&psig=AOvVaw0-PpxDDk6M4ASEUCfdZqji&ust=1556832848008720
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