SPI 13-664-8

<p><strong>Features: </strong> </p> <ul><li>Instant fixation in any position. </li> <li>Single knob controls all three joints. </li> <li>Heavy-duty mechanical lock. </li> <li>Sturdy aluminum arms for maxium rigidity. </li> <li>Fine adjustment. </li> <li>Fits dovetail and 3/8" stem indicators. </li> <li>Mounting thread M8 x 1.25 mm. </li> <li>Magnetic base has 175 lbs. of pull, vacuum base has 3-1/2" dia. </li> <li>Standard models have chrome-plated arm sections; premium models have red anodized arm sections. </li> <li>Indicators in sets include a Certificate of calibration traceable to NIST. </li> </ul>