<h3>Key features</h3><ul> <li>Clamping Range: 1/32" - 5/8"; Shank thread size: 7/16-20; Accuracy: 0.005"</li> <li>R8 Arbor included; JT6 Mount</li> <li>Material: Constructed from sturdy steel, special quenching treated key parts increases durability</li> <li>Feature: Self-tightening key-less feature automatically increasing gripping force, high reliability, and stability</li> <li>Application: Suitable for drill presses or lathes spindle accepts R8 shank</li> </ul><p>Free shipping included. 30-day hassle-free returns.</p>