What the company says about it's products:
These Starrett Outside Micrometers are the most popular precision micrometers used by skilled workmen worldwide. They are accurate, rugged, and easy to use.
The 0 - 6" sizes and 0 - 150 mm sizes have rugged spindles and anvils sized at .270" (6.8 mm) diameter.
* Starrett satin chrome finish - no glare - resists rust
* Advanced sleeve design with staggered lines and distinct figures for precise and easy readability
* Convenient decimal equivalents on some one-inch micrometers
* Ring type knurled lock nut for quick and sure locking
* Smooth friction thimble for uniform pressure, the combination ratchet and speeder for uniform pressure and quicker adjustment, or a plain micrometer that depends on your own "feel"
* Gracefully designed tapered frame for use in narrow slots and tight places
Accuracy and Long-Life Features
* Rigid one-piece steel frame ribbed for extra strength
* Extremely hard and stable one-piece spindle (the heart of our accuracy)
* Micro-lapped measuring faces
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