• Large easy to read 2-1/4'' white face with black markings and crisp graduations
• The body is all metal
• Optional Vertical lug back configuration
• 2" of total travel with graduations of .001” per line
• Accuracy guaranteed to 0.001” per 1”
• Thread size: #4-48
• Steam dia.: 3/8"
• Spindle rack pinions and gear trains are made of high-quality steel components ensuring long life

You have the option to include a lug back. If you choose that option, you will receive both the flat back and the lug back.