The Irwin Impact Driver Ready Mag Nutsetters are impact-rated nutsetters are used with impact drivers and also work with power drills and power screwdrivers. Sometimes called torsion nutsetters, they absorb the force (torque) of the impact driver and transfer it to the nut or bolt. They're commonly used to drive lag bolts and loosen frozen nuts and bolts. Their head fits hex-shaped nuts and bolts. Available in 1/4", 3/8", 5/16", 7/16", and 1/2" size options.

Features:

• Lobular design drives fastener on side instead of corner for less stripping and longer life
• Rare earth magnets hold fasteners securely with four times the hold of standard magnets
• quick-change shank is designed to work with impact drivers, and reduces slipping in standard drill chucks