for square drive screws (Robertson), everyday tool for all screwdriving applications in industry and trade, manual and machine use, compatible external hexagon according to DIN ISO 1173, suitable for receptacle D 6.3, precise, dimensionally accurate tip, optimum fit in the screws, color-coded according to screw type, the right bit quickly to hand, toughness as well as hardness optimally balanced, exceptionally long service life, tough-hard, special tool steel, attractive plasma coating for rust protection