The Bolt Eater is a portable unit designed for the fast removal of large bolts and core sampling. The heavy-duty, roll-around machine packs enough power to make a one-inch diameter hole four-inches deep in twenty minutes ......The Bolt Eater is a portable unit designed for the fast removal of large bolts and core sampling. The heavy-duty, roll-around machine packs enough power to make a one-inch diameter hole four-inches deep in twenty minutes with a graphite electrode. This machine often used by power generators and pulp and paper factories for repairing equipment where bolts and studs have fused or rusted in place and must be removed.