Precise Pro-Series R8 ER Collet Chucks

• Made of 20CrMnTi alloy steel
• Electrolysis nickel coating
• Premium hardened & all ground body for extended tool life.
• Thread of Drawbar End: R8- 7/16" -20
• Maximum RPM is 8,000
• T.I.R. <= .0002"
• Superior Finish