Machine-mounted Phillips screwdriver bits specially intended for impact screwdrivers. The properties and design of the tip produce the best striking power and the longest service life when attached directly to the screwdriver. Made from precisely heat-treated S2 tool steel with a design that will withstand heavy use. Packed in a resealable and hangable plastic box of 10. The type of screw can be easily seen by the color of the ring on the stem of each tip.