SuperKrome finish provides long life and maximum corrosion resistance. SureGrip hex design drives the side of the fastener, not the corner. Feature a thicker shank and rounded edges for improved gripping and increased comfort. Made in the U.S.A. Lifetime warranty 23 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. Set includes: 12 point combination wrenches - 1/4", 9/32", 5/16", 11/32", 3/8", 7/16", 1/2", 9/16", 5/8", 11/16", 3/4", 13/16", 7/8", 15/16", 1", 1-1/16", 1-1/8", 1-3/16", 1-1/4", 1-5/16", 1-3/8", 1-7/16" and 1-1/2".