Elitexion 3 Pcs Magnetic Nut Driver Setter Bit 1/4" Hex Drive for 1/4", 5/16" and 3/8" Set 3 Pcs Magnetic Nut Driver Nut Setter Bit 1/4" Hex Drive. Fits most power tool screwdrivers. Heat treated CR-V Steel. Ideal for extended reach applications.