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Amazon.com With its durable SuperKrome finish, the SK Hand Tools 20-Piece SuperKrome Fractional/Metric Short Combination Wrench Set stands up to harsh working environments. The high polish finish ensures long life and maximum corrosion resistance. All wrenches feature the SureGrip hex design, which drives the side of the fastener, not the corner, to avoid edge breakage. Box ends are also counter-sunk to help lead the wrench over fastener heads. The open end is angled 15 degrees for greater access. The handle edges are rounded for improved gripping and increased user comfort. This set comes with a lifetime warranty. What's in the Box 3/8-, 7/16-, 1/2-, 9/16-, 5/8-, 11/16-, 3/4-, 13/16-, 7/8-, and 15/16-inch wrenches; 10-, 11-, 12-, 13-, 14-, 15-, 16-, 17-, 18-, and 19-millimeter wrenches. Product Description Sk Professional Tools was founded in the early 1900s as the Sherman-Klove Company by Mason H. Sherman and Noah Grover Klove. In the early days, we specialized in contract work, producing tools and parts for other companies. After a brief period producing munitions and mortar shell casings during WWI, we returned to our true love and what still drives us today – manufacturing quality tools for the American technician. From the original Round-Headed Ratchet to the SK® X-FRAME® Ratcheting Wrench, we’ve been innovating for American professionals since day one. Today, as part of IDEAL INDUSTRIES, INC., SK Professional Tools manufactures over 3000 products and continues our commitment to providing quality, American-made innovation to the toughest professionals in the world. From the Manufacturer 20 piece set is made in the U.S.A., featuring SK's high polish SuperKrome® finish, which protects the tools from the harsh working environments found in today's workplace, while providing long life and maximum corrosion resistance. The SureGrip® wrenching design on wrench box ends, drives the side of the hex of the fastener, not the corner, to increase torque and avoid edge breakage, especially on rusted or damaged fasteners. Box ends are also countersunk to help lead the wrench over fastener heads. The open end is angled 15 degrees for greater access. The box end design features a 15 degrees offset head, which provides usefull clearance and a smooth arc radius design for improved strength and durability. Handle edges are rounded for improved gripping and increased user comfort. Short pattern design enables greater access in confined spaces.