http://www.mate.com/en/products-and-parts/fabrication-solutions/rollerball(The original link is mis-posted)
Interesting tool - I like the video
The Mate Rollerball™ tool creates stiffening ribs and decorative beads in sheet metal parts without a secondary operation. It is available in popular tool styles including: Ultraform for Thick Turret, Thin Turret, 112/114, and Trumpf style.