Starrett SA 707. - Square Steel Gage Block Accessory - Internal Measuring Machine Jaws (0.500in)
The Starrett Internal Measuring Machine Jaws are double-ended, self-proving, assuring parallelism and squareness. Designed for use with square-style gage blocks, the jaws are made of hardened steel material, 2.000in long, 1.000in wide, and .500in thick. Both side edges are lapped 90-degree square to the gaging faces within 30 seconds of arc and extend beyond the gage blocks in the combination, thus forming a square master.
See Data Sheet for additional details.