Screwdriver bits are specifically designed with a PH2 (Phillips #2) tip, which is a common size for Phillips head screws., Term "Autofeed" suggests that these screwdriver bits are designed to be used with autofeed screwdriver systems., PH2 size is a widely used standard for many screwdriving applications, making these screwdriver bits suitable for various projects, including construction, woodworking, furniture assembly, and more.