This 1/2" Drive MAXX Locking Flex Ratchet by Armstrong has a 9-position locking flex head that maximizes safety and maintains position for multi-angle, multi-application use regardless of load. This wrench has a unique enclosed head (no screws) with two O-rings that resists contaminants for extreme strength and long life. The sleek tapered head with a low profile design permits access in extremely confined areas. Recessed reversing lever has On/Off marking for safety. The torque wrap design reduces stress on gear and pawl teeth for greater strength and durability. An improved modified "hour glass" handle design conforms to the shape of the hand for maximum comfort and minimal fatigue. Manufactured from high alloy steel using the most up-to-date manufacturing process and heat treat for greater strength and durability. Meets or exceeds ASME and US Federal specifications.