FEATURES: Heavy Duty Magnetic Keeps Bits in Place. Bit Retention System Keeps Bits Secure. Superior Quality. Tough Case container keeps bits organized and protected. Compact magnetic drive guide holds the screw in place while driving to allow for one-handed fastening. Assorted sizes of Phillips, Slotted and Square bits for almost any task. Compatible with all drills and power screwdrivers. Heat treated for longer life. Magnetic Drive Guide reduces stripping and wobbling. Magnets allow case to be fixed to any ferrous surface. Built-in hooks for hanging case.