DEEP WELL -- Every professional mechanic needs a deep well extraction socket set, Used to Damaged, Frozen, Studs, Rusted, Rounded-Off Bolts, Spark Plug, Nuts & Screws REVERSE SPIRAL FLUTE -- This spiral deep well extractor socket is designed to bite down to provide maximum gripping power, The uneven internal wall helps support the hard nut, and the more you rotate it, the tighter the grip will be and the easier it will be to not break or slide DIMENSIONS -- 11 Pieces broken bolt extractor kit included 9pcs extraction socket 1/4", 5/16"(8mm), 3/8", 7/16"(11mm), 1/2", 9/16"(14mm), 5/8"(16mm), 11/16", 3/4"(19mm); 1pcs 3/8" hex adapter and 1pcs knockout bar DUAL-SIZED -- Our nut extractor socket set works with both SAE and Metric fasteners, and Square drive with hex base for use with an impact gun, ratchet, wrench, or pliers Meet or Exceed ANSI standards -- Each socket tool is made of chrome molybdenum alloy steel (cr-mo) for exceptional strength and long-lasting durability, and gray oxide coating provides superior corrosion resistance Every professional mechanic requires our versatile deep well extraction socket set, perfect for tasks such as damaged, frozen, studs, rusted, or rounded-off bolts, spark plug, nuts, and screws. This high-performance set uniquely integrates a reverse spiral flute design for maximum gripping power. The innovative design of an uneven internal wall supports even the hardest nuts. As you rotate it more, the grip becomes firmer, simplifying the removal of bolts without breakage or slippage. Our 11-piece broken bolt extractor kit includes nine extraction sockets sized at 1/4", 5/16"(8mm), 3/8", 7/16"(11mm), 1/2", 9/16"(14mm), 5/8"(16mm), 11/16", and 3/4"(19mm). It also features a 3/8" hex adapter and a knockout bar, providing a comprehensive solution for various extraction tasks. One of the most remarkable features of our nut extractor socket set is its dual-sized nature. It works efficiently with both SAE and Metric fasteners. This robust set includes a square drive with a hex base designed for use with multiple tools, such as an impact gun, ratchet, wrench, or pliers, making it a versatile addition to your toolbox. Meeting or exceeding ANSI standards, each socket tool in this set is crafted from chrome molybdenum alloy steel (cr-mo), ensuring exceptional strength and long-lasting durability. The gray oxide coating further enhances the set by providing superior corrosion resistance, guaranteeing the reliability and longevity of your tools. Put simply, this set is an indispensable asset to any serious mechanic or DIY enthusiast.