• Minimum Hole Size (Letter): A
• Maximum Hole Size (Letter): Z
• Number of Holes: 26
• Used to select or check drill sizes from "A" to "Z"
• Each gauge hole is marked by letter and its decimal equivalent from 0.234 inch diameter through 0.413 inch diameter
• Made of high quality steel
• Satin chrome finish
• Offer a quick and accurate way of checking drill and rod sizes