Precise Pro-Series 12 Piece 1/16″-1/2″ ER-20 Spring Collet Set With Rack – 3901-5364

• Collets include 1/16″-1/2″.
• ER-20 Series – Major Diameter: .830″, Overall Length: 1.230″
• Made of high grade alloy tool steel.
• Hardened and precision ground to 44-48HRC.
• Surface treated to reduce rust and improve hardness.
• Exceeds Federal specifications.
• Inside diameter has been ground to reach mirror finish for increased grip force.

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