GRAFF produces hex-shank screwdriver bits SW4x25 mm. They are tools for a standard self-clamping or three-jaw chuck and are also equipped with kerfs for collet clamping. The tip is made of high-strength steel with preliminary toughening of the cutting part with the fastener. The bit can be used for work with various types of self-tapping screws equipped with the corresponding hexagonal slot. Shank hardness is 60 HRC, so that the bit is solid and durable. It is sold in blister packs.