It is a replacement clamping nut used in an ER11 collet chuck system to securely hold cutting tools or drill bits in CNC machines and spindles.

Uses:

• Securely clamps ER11 collets in the tool holder.
• Holds end mills, drill bits, and engraving tools firmly.
• Helps maintain accurate tool alignment and concentricity.
• Reduces tool slippage during machining operations.
• Used in CNC routers, milling machines, engraving machines, and spindle motors.