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Milwaukee 48222536 Nut Driver features 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 & Spline. Designed for maximum durability the Wrench ready hex steel shanks are forged and chrome plated. Milwaukee Nut Drivers are designed for the jobsite and for general everyday use.