Neiko 10250A Magnetic Hex Nut Driver Master Kit, Cr-V Steel | 1/4" Quick-Change Hex Shank | SAE & Metric | 12-Piece Set Magnetic nut setter can be be used with an impact/bit driver or hex socket ratchet to securely grab hexagonal nuts and fasteners for easy installation or loosening/removal Industrial grade chrome vanadium steel construction with black phosphate coating for increased hardness, high strength and abrasion/corrosion resistant Full master set comes with nut driver bits in both metric and SAE with each setter size clearly engraved on the side for easy identification Lobular design head fasteners with rounded edges grab nuts by the sides rather than corners to prevent stripping and lengthen service life Each external hex nut socket has a 1/4" socket that is compatible with quick-change/release chucks and locks firmly in standard chucks