Sunex 3580, 3/8 Inch Drive Master Impact Socket Set, 80 Piece, SAE/Metric, 5/16 Inch - 3/4 Inch, 8mm - 19mm, Standard/Deep/Universal, Cr-Mo, Radius Corner, Chamfered Opening, Dual Size Markings, Heavy Duty Storage Case, Includes Star and Inverted Star Sockets, 4 Extensions, Universal Joint 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. 80 PIECE SET: Most complete  drive set on the market. FULL COMPLEMENT OF EXTENSIONS: Provides access to virtually all recessed fasteners. UNIVERSAL JOINT: Adapts any socket for use in swivel applications.