Perfect for a variety of tasks, this 31 in 1 Screwdriver Set is one of the most versatile and unique gadgets to have in your toolbox. Set contains 1 screwdriver base with 30 different driver bits. Simple to use - just choose your bit and insert it into base. Screwdriver has a magnetic head so bits stay in place while you work. Great for tight places, smaller sized screw heads and best of all: the entire set is packaged inside a twist close case. Screwdriver base measures approximately 3 3/4" long and drill bits vary in size.