Borebit

Borebit is an Autobot from the Marvel portion of the Generation 1 continuity family.

Borebit is probably the driller on the right.

Borebit is one of the Autobots under Perceptor's command on Cybertron.

Fiction

Borebit, along with Corkscrew, was used to burrow into Darkmount during the Autobots' attack to destroy the space bridge.

It is unknown how he fared in the battle. Probably not well, since the Autobots were attacked immediately upon going topside. The Bridge to Nowhere!

Borebit was once a member of the Primal Vanguard. His spare drill bit found its way into the collection of Ironfist, avid Vanguard fan. An Intimate Beheading Much later, Borebit was killed by Tesarus of the Decepticon Justice Division in a matter that Tarn later noted as "particularly innovative" in Tesarus's performance review. The Permanent Revolution

Which driller is Borebit is never clarified. It's possible he's the one on the right simply because of the whole left-to-right reading structure of English, as his name is given second. That both robots only appear in silhouette doesn't help.