Impact Bolt & Nut Remover Set, 13 Pieces Bolt Extractor Tool Set with Solid Storage Case，Easy to Remove the Rusty and Stubborn Sokets and Bolts HIGH POWER AND IMPACT RESISTANCE: Bolt nut remover Processed from high hardness chrome molybdenum steel, Reverse spiral flutes are designed to bite down to provide Maximum gripping power. METRIC & SAE SIZES: 13 pieces 3/8 inch drive bolt & nut remover comes with 3/4"(19mm), 11/16", 17mm, 5/8"(16mm), 9/16"(14mm), 13mm, 1/2", 12mm, 7/16"(11mm), 10mm, 3/8", 5/16"(8mm), 1/4" UNIVERSAL DESIGN：3/8-Inch square drive for use with hand ratchets, impact wrenches and air ratchets. WIDE RANGE OF APPLICATION: The special internal thread design are precision engineered to easily extract damaged bolts, nuts and screws even if they are stripped, rusted or frozen. SAFE STORAGE: Heavy duty blow molded case lets all the bolt remover stay organized