The MILWAUKEE 21mm Flex Head Ratcheting Combination Wrench features 2.5 degrees of arc swing and 144 ratcheting positions, allowing quick and efficient work in tight spaces. The flex head wrenches have double-stacked pawls within the ratcheting mechanism, which increases durability and extends the life of the tools. The flexible head allows for increased accessibility in areas that are difficult to reach. The MAXBITE Open-End Grip improves the wrench's grip on nuts and bolts, offering 25% more torque than smooth-faced wrenches. This flex head wrench features ergonomic I-Beam handles designed for improved comfort and ink-filled size labels for easy size identification and quick distinction between SAE and metric sets. Milwaukee combination wrenches feature a lifetime guarantee.