ER
The ER is the most commonly used clamping system in the world. The ER bushes are made of spring steel and fully hardened, making them ideal for many types of machining: drilling, milling, reaming, threading and grinding.
![](https://toolsmach.com/c/60-category_default/er.jpg)
The ER is the most commonly used clamping system in the world. The ER bushes are made of spring steel and fully hardened, making them ideal for many types of machining: drilling, milling, reaming, threading and grinding.