The most important factor in pressing is selecting the correct alloy that closely matches the coefficient of thermal expansion of the glass tube, when sealing reed switches. Wires of a special alloy of Nickel-Iron called 52-alloy are selected for this purpose. Due to the large volume of reed blades that need to be pressed, Carbide press tools ensure that tool wear out is minimal. The wire is fed through multiple straightener stations and into press tools that are designed in various ways to work with the various sizes of wire and type of reed switch load that needs to be switched. The reed blades are checked for burrs at the contact area and the lead out area where cropping occurs, then inspected for straightness and surface smoothness, and then approved for degreasing.