Milwaukee torque lock locking tools provide faster tool setup and more locking force for the professional tradesmen. The patent pending thumb screw provides the user with a more convenient geometry for hand force, while providing clearance to generate more torque with the unique screwdriver through-hole design. Featuring hardened jaws for increased gripping power and forged alloy steel for maximum durability, the Milwaukee 48-22-3521 is perfect for the toughest of jobsites. Milwaukee stands behind their product and offers a Limited Lifetime Warranty with all locking tools.