Easily removes damaged screws and bolts. HVAC, Electical, Plumbing, Auto & MRO applications. Maximum Gripping Power - Reverse spiral flutes are designed to bite down. Shear Resistant Shank - High Carbon Steel Shank is larger than most fastener shanks and resists torsional shear. Grips both Metric and SAE - Universal Lobular Design fits both sizes. Works with Most Popular Tools - 1/4" Hex Shank for use with cordless drills, impact drivers, corded drills and nut runners. Power Groove allows for use with Quick Change Adapters. Black Oxide Finish with White Markings - Prevents rust & easy to read markings.