The Extra Hard Screwdriver Bit is a good choice for universal useThe set contains various screwdriver bitsComes in a small and compact case with a transparent lid, which fits onto a belt for easy accessColour-coded for quick overview and recognition of the appropriate bit typeThe Screwdriver Bit Set, 32-piece comes in a practical and robust storage box providing a good view of its contents as well as safe storage and transport.It has a 1/4-inch external hex shank and is intended for universal screw-driving with screwdrivers and drill drivers.