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The SK Hand Tool 86017 is a 13-Pc SuperKrome Fractional Long Pattern Combination Wrench Set. It features high polish SuperKrome finish, which protects the tools from the harsh working environments found in todays workplace, while providing long life and maximum corrosion resistance. The patented 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. Its box ends are also countersunk to help lead the wrench over fastener heads. The heads are angled 15 for greater access. Open ends also feature a smooth arc radius design for improved strength and durability. The handle edges are rounded for improved gripping and increased user comfort.