Durston offers two styles of the VIM Tools Hex XL Driver Set including the HXL100 7-pc. ball hex and 7-pc. hex in sizes 1/8" through 3/8", and the HXLM100 7-pc. ball hex and 7-pc. hex in sizes 3 mm through 10 mm. All hex blades are constructed of S2 steel, RC 58/62 and are black oxide plated. The bit holders are constructed of CRV steel, heat-treated and chrome-plated, with set screw bit retention.