End Mill Holder, Tormach TTS, 12 mm 

Quick change Tormach 12 mm set screw tool holder for end mills and other milling tools.

Tormach screw holders are suitable for general milling operations and are intended to be used with end mills that have a Weldon shank (flat surface on shank). They can also be used with certain Silver & Deming style drill bits.

The tool holder has a set screw on one side and a balancing dimple on the other side. The balancing dimple reduces vibrations at speeds above 8000 RPM.

See Chris' Tips regarding centering of end mills when using a set screw holder.