Starrett CYLINDER GAGE, 2-1/2" - 6" RANGE 452B FEATURES  Dial is graduated to show plus or minus  Bezel may be rotated for zero setting  Sled is hardened and ground for long, accurate life and has two long-line contacts in constant alignment with the cylinder wall.  The locking screw (stem protruding above the dial) clamps the contact points in position for measurement with a micrometer  The handle can be locked in any perpendicular or angular position and may also be transformed by a slight turn into a toggle joint with a wide sweep  Extra handles may be ordered to make a long extension  Handle Extension PT06722, 8-5/8" in Length SPECIFICATIONS  Made in America: Yes  Type: Cylinder Gage  Range (in): 2 - 1/2 to 6"  Graduations (in): .001"  Dial Reading: 0 - 100