4 Piece, Magnetic Pivoting Nut Driver Set, 1/4", 5/16", 3/8" & 7/16", Product Designed For Use In Impact Drivers & Wrenches, Recessed Corners = Drives On Flats Which Minimizes Shavings, Industrial Strength Magnet Maximizes Fastener Retention, Pivoting Product Pivots Up To 20 Degrees Allowing 1 To Get Into Tight Spaces Or Corners.