High Quality Raw Material: Screwdriver bits made of chrome vanadium steel, corrosion resistant and durable through high temperature quenching treatment. Practical Design: Magnetic screwdriver bits have a 6.35mm diameter hex shank for quick and easy changing, strong compatibility. Wide Application: Long screwdriver bits are suitable for home DIY, woodworking, auto parts, professional machine maintenance, etc. Complete Kit: You will get a set of 12 magnetic bit holders, the size is 25mm/50mm/65mm/70mm/90mm/150mm. Wide Compatibility: Magnetic screwdriver bit holder compatible with Bosch, Milwaukee, DeWalt, Metabo, Makita, etc.