The professional may use Klemko wire-end sleeves (ferrules) to make flexible wires connect. These connections are failsafe. This is an NEN(ISO) 1010 requirement for screw joints. End sleeves are very functional when the installer makes flexible wires connect with a clamp connection or insert contacts. All insulated ferrules are provided with a conical hopper. This facilitates the entry of individual Litzen in the sleeve. The sleeves are available in color combinations DIN (European standard DIN 46228), Other (German standard) and standard Klemko (French standard). The manufacture of wire-end sleeves is DIN 46228 / 4. Our excellent ferrules are heat resistant up to 105 degrees Celsius. They have a thick plastic collar to avoid voltage transfer.