Nutsetter has a standard 6-sided design for use with sheet metal screws and other hexagonal head fasteners. Uses a rare earth magnet that is 4 times more powerful than common magnets. 1/4-inch quick-change shank, they're designed to work with all types of impact and rotary drivers. Tool-grade construction is suitable for most general-purpose fastener-driving needs. Backed by the IRWIN lifetime guarantee.