These were received from someone. There are eight pieces. These driver bits have a magnetic design. * They can be easily attached to the screwdriver handle and have double ears on both sides of the bit shank. * Excellent replacement for plus, minus, bent, or broken Phillips head driver bits. * Superior Quality: These Phillips head driver bits are made of S2 alloy steel, a material commonly used in high-hardness hardware. * Ideal Magnetic Driver - These bits are suitable for electric screwdrivers, hand screwdrivers, electric drills, air drills, etc.