MAGNET: Better keeps the fastener in the socket. DEEP: Access to parts that need to reach further into the socket, such as bolted joints and clamp bolts. 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. 14 PIECE SET; METRIC: 4mm to 15mm