Precise ER20 Mini-Nut Shank Extension Tool Holder - 202-549

• Collet pocket runout 0.0001"
• All critical surface precision ground
• Shank Length: 5.51
• Made from alloy steel hardened to 54 - 56rc
• Mini ER collet nut provide more clearance in space constrain area
• Precision ground threads to ensure a tight fit when tightening the ER collet into the holder socket
• Coolant through capability with internal set screw included
• Concentricity is less than .0002 inches

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