Screwdriving bits made from chrome vanadium steel (S2 quality) for high durabily and forced closure with the screws
Special diamond coating for extremely safe fit in the screw. Reduction of the "come out" effect, thus significantly reduced workload
The torsion zone permits to equalise torque peaks, since it absorbs forces and vibrations during the screwdriving process. High force load possible; prevents from premature breakage.