"The X-Beam's wider, super-strong crossbeam design increases the wrench's contact area with your hand by 500 over traditional wrenches - you can grasp the wider side of the wrench beam for more power and control with less stress on your hand. Open end features Surface Drive Plus, with reduced fastener rounding and up to 25 more torque. Ratcheting box end needs as little as 5 to move fastener vs. 30 for standard box-end wrenches. Flex Head No, Measurement Type Standard SAE, Pieces qty. 9, SAE Sizes in. 5/16-3/4, Storage Type Tray."
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