New set purchased to add to the first set of PB Swiss slotted screwdrivers purchased over three decades ago. These are the best slotted screwdrivers for Swiss/EU spec slotted screws due to design, materials and production quality. If these screwdrivers are used on US industry standard slotted screws, the blades will be too thin over stressing the screwdriver blade. On Swiss/EU spec slotted screws, they fit excellent. When used properly these PB Swiss slotted screwdrivers have remarkable service life.. as exampled by the first set that is now over three decades old and still delivering as new service.