SuperKrome finish provides long life and maximum corrosion resistance. SureGrip hex design drives the side of the fastener, not the corner. Extra reach to access fasteners deep in compartments, and greater torque for extra turning power in tough applications. Made in the U.S.A. Lifetime warranty19 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 useful clearance and a smooth arc radius design for improved strength and durability. Handle edges are rounded for improved gripping and increased user comfort. Long pattern wrenches deliver extra reach to access fasteners deep in compartments, and provide greater torque for extra turning power in tough applications. Set includes: 12 point long pattern combination wrenches, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm and 24mm.