Milwaukee HollowCore magnetic nut drivers feature a thread-thru design for unlimited depth in threaded rod and long bolt applications. The magnetic universal driver heads fit 4X more fasteners including, square, hex, 12-point and spline. Designed for maximum durability the wrench ready hex steel shanks are forged and chrome-plated. Milwaukee nut drivers are designed for the jobsite.Removes rusted and stripped boltsWrench ready hex shanks deliver additional leverageColor-coded ID markings allow for quick tool identification on jobsiteDeep well sockets drive multiple fastenersMagnetic drivers, secure fitment in fastening applicationsChrome-plated, marine-grade rust protectionForged steel shanks provide longer life and more durability