Color-coded according to size and function, PB Swiss Tools’ Rainbow® Series can be quickly located in toolbox, at workplace, or on construction site. Key sets feature precisely chamfered corners to facilitate insertion into screws, and have tolerances smaller than human hair. Chrome-plated with powder-coated color finish for protection against corrosion, hex keys have perfect-shaped ball-point end, allowing user to turn screws with angle up to 30°.