This premium impaktor bit holder is part of the patented tritorsion system designed for heavy duty high voltage impact drivers the impaktor bit holder has an optional magnetic function to hold screws up to 10quot long it is also suitable for all other screwdriving power tools and industrial applications the tritorsion system means the bit holder has been precision hardened to allow the metal shaft to flex in controlled areas and absorb the stresses applied by constant use in heavy duty imp