Chacacterristic: - with friction bearing for higher clamping force - with sealing disk for coolant through tools - high speed clamping nut (for high rpm) - externally threaded clamping nut for floating chucks - protection against corrosion with a special treatment of the surface for longer life. - rounded thread start prevents damaging of collets on tool changes. The products contains:ER8/11/16/20/25/32/40 TYPE and Our company supports customer customization