There are GRAFF professional bits for a screwdriver PH2x50 mm (Phillips). They ensure high quality at a reasonable price. Bits are made of cold-forged chrome vanadium steel. They are used for twisting conventional and self-tapping screws of various diameters and lengths. Tip hardness is more than 60 HRC. Consistent tip quality and precision make GRAFF screwdriver bit a leader among other tools.