gSource screwdriver bits are manufactured from high quality German surgical stainless steel. Patterns available are cruciform, 1.5mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm hex sizes, and T4 through T25 star drive sizes. All have a quick coupling end and are used in conjunction with gSource quick coupling screwdriver handles to place or remove bone screws. Most can also be used in conjunction with a gSource screw holding sleeve. See our Screwdriver Handles and Screw Holding Sleeves categories for options.