The UARM Swift Pro, Stepper motor driven robotic arm, comes with a Universal Holder (and a gripper). The part described above is a universal adapter for the universal holder.
It can be used as the base of a semicircular platform to mount several types of tools.
Each tool can be accessed simply by rotating the wrist.

The type of holder that you attach to the this Universal adapter for the holder will depend on what type of tool(s) that your mounting. I'm looking at mounting a small drill for drilling holes in circuit boards and a camera mount for a DinoCam digital "microscope".

These files include the Adapter for the universal gripper, the DinoCam Holder and the USB drill sleeve adapter. The USB drill can be powered and controlled through the side port on the UARM PRO (by changing or adapting a plug instead of the USB).

Resources:

UARM Pro: http://www.ufactory.cc/#/en/

Dino-Cam Lite: https://www.microscope.com/index.php/dino-lite-am7013mzt4-400x-470x-5-0mp-metal-handheld-digital-microscope.html?gclid=EAIaIQobChMIt6_E3Kyl1gIVgYdpCh3HMAqQEAYYASABEgJNDfD_BwE

USB drill from Geek.com for about 8$