Handy and convenient set containing popular electricians drills bits and screwdriver bits, perfect for on-site versatility as it includes a range of key sizes, designed for use in a range of materials · · · All contents are Twister impact rated for impact drivers · · Strong magnetic collar locks onto the fastener, holding it firmly in place at any orientation · · Eliminates need to hold fastener giving easier start-ups and maximum user control · · One handed screw driving allows greater reach and flexibilty · · Magnetic collar can be removed allowing screws to be driven below the surface if required · · Colour coded bits for easy size identification · · 1 piece design made from high quality steel for durability and optimum performance in impact drivers · · Drills through multiple materials including lightweight block, soft brick, timber, soft tile and sheet steel