Dividing heads with a horizontal or vertical axis of rotation and a space saving low profile. 

The model ATU implements Ott worm gearing. 
The model ATD implements direct or torque drives. 
The model ATHN is an indexing dividing head with non-lifting Hirth coupling. 

The additional code P designates a model with a pneumatically activated clamp, models without the code P are clamped hydraulically.