Small Tough Case Set containing Extreme Impact Torsion Screwdriver Bits. 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.