This lot of 4 3M 8427-12P cold shrink insulators is an excellent choice for those in need of electrical equipment and supplies. The black sheath color and 12" length make them a versatile option for any project. These cold shrink tubings are ideal for use in wire, cable, and conduit applications, and are sure to provide the necessary insulation for your electrical system. With a range of 250-400kcmil, these tubings are suitable for a variety of electrical applications.