Pro-Grabit works on damaged screws and broken bolts from as small as #4 screw to as large as a 3/8" bolt. It quickly and easily removes most damaged screw types such as Hex, Phillips, Torx, and Square Drive from wood, plastic or metal up to 3 inches in length. Two-step drill bit and extractor in one tool extracts broken bolts and damaged screws fast; use in reverse only when drilling and extracting with reversible hand held power drill. Serrated extracting end of tool results in greater torque for hard to remove bolts and screws. Pro-Grabit is self-centering so it will not wander or walk. The hardened tip works on jaded, uneven, and rough surfaces, so no bolt preparation is required. Made from M2 HSS tool steel and made in USA.