5 Piece, Magnetic Impact Ready Nut Setter Set, Patented Geometry That Reduces Rounding Of The Hex, Advanced Hardening Process Provides Maximum Durability While The Extra Strength Magnet Provides Superior Bit Retention, Recessed Corners For Drives On Flats That Minimize Shavings, Industrial Strength Magnet Maximizes Fastener Retention, Includes: 1/4", 5/16", 3/8", 7/16" & 1/2" Nut Drivers.