Sunex 3351, 3/8 Inch Drive Impact Socket Set, 51-Piece, Metric, 7mm - 22mm, Standard/Deep/ Universal, Cr-Mo Steel, Radius Corner Design, Heavy Duty Storage Case, Meets ANSI Standards LIFETIME WARRANTY WITH SUNEXPRESS: Get in the express lane with the industrys leading warranty program and exchange warranted products directly with Sunex. 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. CHAMFERED OPENING: Quickly aligns fastener to socket. DUAL SIZE MARKINGS: Laser etched and roll stamped markings to ensure permanent socket identification. HEAVY DUTY STORAGE CASE: Convenient impact socket transport and storage. MEETS ANSI STANDARDS: All sockets are rigorously tested, ensuring peak performance and durability. 51 PIECE SET; METRIC: 7mm to 22mm; Includes 1/4 BIT HOLDER SOCKET 3 IMPACT EXTENSION: Provides access to recessed fasteners. UNIVERSAL JOINT: Adapts any socket for use in swivel applications.