TEKTON 1916 Combination Wrench Set, Inch/Metric, 1/4-Inch - 1-Inch, 8 mm - 24 mm, 24-Piece [Older  Model] Drop forged, heat treated chrome vanadium steel Corrosion-resistant chrome plated finish Raised panel for added strength Precision machined 15-degree angled open ends and 12-point offset box ends Meets or exceeds ANSI standards