This is a modular base for the Unlimbited Arm (found here: http://www.teamunlimbited.org/the-unlimbited-arm/). The base scales parametrically with the Unlimbited arm. It is connected to the thermoformed gauntlet using the same wrist pins as the Unlimbited arm.

The base can be used for any number of attachments that fit into the five octagonal holes. The attachments are held in place by magnets.