SPI 13-669-7

<p><strong>Features: </strong> </p> <ul><li>Matched pair. </li> <li>Precision ground and case hardened on all six surfaces. </li> <li>Squareness on all sides to 0.0001". </li> <li>11 holes on three faces. Five 5/16-18 tapped holes arranged for holding down and conversion to an angle plate. </li> <li>Surface finish 6 to 16 micro inches. </li> <li>Blocks are over sized to allow for normal lapping to 0.0003". </li> </ul>