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This watchmakers 7 size screwdriver kit contains straight blade screwdrivers that feature color-coded hex heads (for size identification) and reversible blades. These quality screwdrivers feature a rotating head so that when you hold the top with one hand, you are able to easily/quickly twist the screw out with the other hand. The reversible blades change by using the tightening nut at the end of the screwdriver - making it very quick to reverse blades or replace screwdriver blades. Blades are tempered and finely ground to exact specifications. Made in France