The Anglo American Tools NES5 Tight Space Thread Restorer is a universal, external thread repair tool. The high speed stainless steel cutter floats in its position to enable the tool to smoothly repair inch or metric, right or left handed, coarse or fine threads. The tool automatically adjusts to fit bolts of 3/8" to 11/16" (10mm to 18mm) and requires only 5/8" clearance around the bolt.