hilmor 1885435 Magnetic Nut Set, 1/4", 3 Piece A rare-earth magnet helps maintain a secure hold to keep fasteners firmly in place Bits are specially manufactured for use with impact drivers A color-coded band makes size identification simple Designed to drive fasteners on the side instead of the corners, reducing breakage and stripping The 1/4" quick-change shank is designed for use in impact drivers and rotary drills