SUNEX Tools 2504, 1/2 Inch Drive Impact Extension Set, 4 Piece, SAE, 3 15 Inch, Cr Mo Steel, Radius Corner Design, Wobble Drive, Steel Ball Retainer, Dual Size Markings, with Storage Tray

CR-MO STEEL: Provides the strength and flexibility to handle high torque impact tools. RADIUS CORNER DESIGN: Reduces wear and increases torque on fasteners by placing force on fastener walls rather than fastener corners. WOBBLE DRIVE: Provides 15-degree offset in all directions. STEEL BALL RETAINER: Designed on male end. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions., Weight: 0.03 pounds, Manufacturer: Sunex International