7 Piece, Magnetic, Hollow Core Sea Nut Driver Set, Set Consists Of: 1/4", 5/16", 11/32", 3/8", 7/16", 1/2" & 9/16" Hollow Core Magnetic Nut Drivers, Ideal For Long Bolts Or Threaded Rod Applications, Magnetic Drivers Secure Fitment In Fastening Applications, Universal Driver Head Fits 4 Times More Fasteners, Removes Rusted & Stripped Bolts, Color Coded Id Markings Allow For Quick Tool Identification On Jobsite, Wrench Ready Hex Shanks Deliver Additional Leverage, Chrome Plated Provides Marine Grade Rust Protection, Forged Steel Shanks Provide Longer Life & More Durability, Deep Well Sockets Drive Multiple Fasteners, Includes 9/16" Driver.