This wrench is included with the ER40 Fixture assembly and is used to tighten the top nut on the ER40 collet to secure the stock in place. This wrench can be purchased if the original is lost or damaged.

The V2-50 spindle is installed into the spindle mount with an ER40 Fixture assembly and as such this wrench can also be used to loosen the V2-50 spindle and adjust the amount the spindle is extended (example shown ).