Bluespot 13mm Torque Magnetic Power Nut Bolts Hex Head Setter 1/4" 2pc The Blue Spot Tools 2 PCE 13mm Magnetic Nut Driver is manufactured from heated treated and tempered steel alloy for increased strength and durability with a blackened carbon coating to protect against corrosion. The 1/4" is ideal for use with power drills and electric screwdrivers for the precise driving of nuts, bolts and hex head screws. Strong magnets hold fasteners securely for ease of use. Manufactured from 40CR steel for increased durability Nut setters are designed for driving hex head screws Ideal for delivering more torque to the tip without causing damage For use with power tools